Hãy trả lời em tại sao? Tập 11

["v\u1ecb tr\u00ed n\u00e0y n\u1eb1m \u1edf ph\u1ea7n cu\u1ed1i c\u1ee7a c\u1ea7u v\u1ed3ng: n\u1ebfu b\u1ea1n \u0111ang \u0111\u1ee9ng t\u1ea1i \u0111\u00f3, m\u1ed1i li\u00ean quan c\u1ea7n thi\u1ebft gi\u1eefa m\u1eb7t tr\u1eddi, m\u00e2y v\u00e0 b\u1ea3n th\u00e2n b\u1ea1n kh\u00f4ng c\u00f2n n\u1eefa. \u0110i\u1ec1u \u0111\u00f3 kh\u00f4ng n\u00f3i l\u00ean r\u1eb1ng m\u00e0n l\u00e1i xe xuy\u00ean qua m\u1ed9t c\u1ea7u v\u1ed3ng l\u00e0 \u0111i\u1ec1u b\u1ecba \u0111\u1eb7t c\u1ee7a tr\u00ed t\u01b0\u1edfng tu\u1ee3ng. Thu\u1eadt ng\u1eef \u201cl\u00e1i xuy\u00ean qua\u201d n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1i m\u00e0 m\u1ecdi ng\u01b0\u1eddi th\u1ea5y khi h\u1ecd ngh\u0129 h\u1ecd \u0111ang ch\u1ea1y qua m\u1ed9t c\u00e1i c\u1ea7u v\u1ed3ng l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a tia s\u00e1ng m\u1eb7t tr\u1eddi b\u1ecb kh\u00fac x\u1ea1 khi g\u1eb7p c\u00e1c gi\u1ecdt m\u01b0a r\u01a1i r\u1ea5t g\u1ea7n xe c\u1ee7a h\u1ecd, c\u00f3 th\u1ec3 d\u01b0\u1edbi d\u1ea1ng b\u1ecb phun l\u00ean t\u1eeb m\u1eb7t \u0111\u01b0\u1eddng. Do n\u1eb1m \u1edf v\u1ecb tr\u00ed c\u1ed1 \u0111\u1ecbnh, nh\u1eefng tia n\u01b0\u1edbc n\u00e0y s\u1ebd t\u1ea1o ra m\u1ed9t m\u00e0n m\u00e0u s\u1eafc \u0111\u1eb9p m\u1eaft, m\u00e0n n\u00e0y xu\u1ea5t hi\u1ec7n nh\u01b0 l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a chi\u1ebfc c\u1ea7u v\u1ed3ng kh\u1ed5ng l\u1ed3 b\u1eaft ngang tr\u1eddi. V\u00ec v\u1eady, b\u1ea1n s\u1ebd c\u00f3 m\u1ed9t c\u1ea3m nh\u1eadn r\u1ea5t s\u1ed1ng \u0111\u1ed9ng v\u1ec1 vi\u1ec7c l\u00e1i xe xuy\u00ean qua c\u1ea7u v\u1ed3ng, nh\u01b0ng khi b\u1ea1n nh\u00ecn v\u00e0o k\u00ednh chi\u1ebfu h\u1eadu, b\u1ea3n ch\u1ea5t c\u1ee7a \u1ea3o gi\u00e1c \u0111\u00f3 s\u1ebd tr\u1edf n\u00ean r\u00f5 r\u00e0ng - kh\u00f4ng c\u00f3 chi\u1ebfc c\u1ea7u v\u1ed3ng n\u00e0o xu\u1ea5t hi\u1ec7n \u1edf \u0111\u00f3. 126 T\u1ea1i sao \u00e1nh s\u00e1ng c\u1ee7a m\u1ed9t th\u1ecb tr\u1ea5n \u1edf xa \u0111\u00f4i khi l\u1ea1i l\u1ea5p l\u00e1nh? Hi\u1ec7u \u1ee9ng l\u1ea5p l\u00e1nh l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng h\u1ed7n lo\u1ea1n c\u1ee7a kh\u00f4ng kh\u00ed g\u00e2y ra do nhi\u1ec7t l\u00e0m thay \u0111\u1ed5i m\u1eadt \u0111\u1ed9 c\u1ee7a kh\u00f4ng kh\u00ed v\u00e0 do \u0111\u00f3 l\u00e0m thay \u0111\u1ed5i lu\u00f4n c\u00e1c \u0111\u1eb7c t\u00ednh quang h\u1ecdc c\u1ee7a kh\u00f4ng kh\u00ed \u1edf \u0111\u00f3. Nhi\u1ec7t b\u1ed1c l\u00ean t\u1eeb nh\u1eefng 150","t\u00f2a nh\u00e0 trong c\u00e1c th\u1ecb tr\u1ea5n b\u1ea3o \u0111\u1ea3m kh\u00f4ng kh\u00ed lu\u00f4n lu\u00f4n chuy\u1ec3n \u0111\u1ed9ng h\u1ed7n lo\u1ea1n xung quanh t\u00f2a nh\u00e0 nh\u01b0ng ch\u00fang ta th\u01b0\u1eddng kh\u00f4ng ch\u00fa \u00fd c\u00e1c hi\u1ec7u \u1ee9ng c\u1ee7a ch\u00fang xu\u1ea5t hi\u1ec7n tr\u00ean c\u00e1c ngu\u1ed3n s\u00e1ng n\u1eb1m g\u1ea7n k\u1ec1 b\u1edfi v\u00ec nh\u1eefng ngu\u1ed3n nhi\u1ec7t n\u00e0y r\u1ea5t nh\u1ecf, t\u00f9y thu\u1ed9c v\u00e0o k\u00edch th\u01b0\u1edbc b\u00ean ngo\u00e0i c\u1ee7a t\u00f2a nh\u00e0. Ngo\u00e0i ra, \u00e1nh \u0111\u00e8n t\u1eeb c\u00e1c th\u1ecb tr\u1ea5n xa tho\u1eaft \u1ea9n tho\u1eaft hi\u1ec7n khi\u1ebfn hi\u1ec7u \u1ee9ng c\u1ee7a n\u00f3 c\u00f3 m\u1ed9t t\u00e1c \u0111\u1ed9ng m\u1ea1nh, l\u00e0m cho ch\u00fang ta th\u1ea5y gi\u1ed1ng nh\u01b0 \u0111ang nh\u1ea5p nh\u00e1y. M\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u1ef1, ng\u1eabu nhi\u00ean, \u0111\u00f3 l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c v\u00ec sao v\u00e0 c\u00e1c h\u00e0nh tinh tr\u00ean b\u1ea7u tr\u1eddi \u0111\u00eam. H\u00ecnh \u1ea3nh nh\u1ea5p nh\u00e1y gi\u1ed1ng nh\u01b0 m\u1ed9t \u0111i\u1ec3m s\u00e1ng c\u1ee7a c\u00e1c ng\u00f4i sao \u1edf v\u1ecb tr\u00ed r\u1ea5t xa do ch\u00fang b\u1ecb t\u00e1c \u0111\u1ed9ng c\u1ee7a kh\u00f4ng kh\u00ed chuy\u1ec3n \u0111\u1ed9ng h\u1ed7n lo\u1ea1n nhi\u1ec1u h\u01a1n c\u00e1c h\u00e0nh tinh r\u1ea5t nhi\u1ec1u trong khi c\u00e1c h\u00e0nh tinh t\u01b0\u01a1ng \u0111\u1ed1i \u00edt l\u1ea5p l\u00e1nh. 127 M\u1ed9t inch tuy\u1ebft b\u1eb1ng kho\u1ea3ng bao nhi\u00eau n\u01b0\u1edbc m\u01b0a? \u0110\u00e2y c\u00f3 v\u1ebb l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi qu\u00e1 d\u1ec5: \u0111\u00f3 ch\u1ec9 l\u00e0 vi\u1ec7c t\u00ecm hi\u1ec3u t\u1ec9 l\u1ec7 gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a tuy\u1ebft v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc m\u01b0a r\u1ed3i nh\u00e2n t\u1ec9 s\u1ed1 \u0111\u00f3 cho th\u1ec3 t\u00edch tuy\u1ebft s\u1ebd ra \u0111\u01b0\u1ee3c th\u1ec3 t\u00edch n\u01b0\u1edbc m\u01b0a t\u01b0\u01a1ng \u1ee9ng. 151","V\u1ea5n \u0111\u1ec1 \u1edf \u0111\u00e2y l\u00e0 c\u00f3 r\u1ea5t nhi\u1ec1u lo\u1ea1i tuy\u1ebft: m\u1ed9t nghi\u00ean c\u1ee9u v\u00e0o gi\u1eefa th\u1eadp ni\u00ean 1960 c\u1ee7a tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc Hokkaido c\u1ee7a Nh\u1eadt \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng c\u00f3 kh\u00f4ng \u00edt h\u01a1n 80 lo\u1ea1i tuy\u1ebft, t\u1eeb c\u00e1c tinh th\u1ec3 h\u00ecnh th\u00e1p \u0111\u01a1n gi\u1ea3n cho \u0111\u1ebfn c\u00e1c b\u00f4ng tuy\u1ebft c\u00f3 c\u1ea5u tr\u00fac l\u1ee5c di\u1ec7n kinh \u0111i\u1ec3n. C\u00e1c lo\u1ea1i tuy\u1ebft n\u00e0y c\u00f2n tr\u1ed9n l\u1eabn v\u1edbi nhau theo r\u1ea5t nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, t\u1ea1o ra nh\u1eefng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kh\u00e1c nhau c\u1ee7a tuy\u1ebft, c\u00f3 t\u1ec9 l\u1ec7 v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc m\u01b0a c\u0169ng kh\u00e1c nhau. \u0110\u1ed1i v\u1edbi lo\u1ea1i tuy\u1ebft m\u1ecbn nh\u1ea5t - kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u1ecf nh\u1ea5t - h\u1ec7 s\u1ed1 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng \u1ee9ng l\u00e0 50:1 (50 inch tuy\u1ebft t\u01b0\u01a1ng \u1ee9ng 1 inch n\u01b0\u1edbc m\u01b0a). Trong khi \u0111\u00f3, c\u00e1c tinh th\u1ec3 tuy\u1ebft n\u00f3ng l\u00ean khi ch\u1ea3y xu\u1ed1ng d\u1ed1c tr\u00ean m\u1eb7t \u0111\u1ea5t l\u1ea1i c\u00f3 m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u1edbn h\u01a1n nhi\u1ec1u, v\u00e0 h\u1ec7 s\u1ed1 chuy\u1ec3n \u0111\u1ed5i ch\u1ec9 l\u00e0 4:1 (4 inch tuy\u1ebft b\u1eb1ng 1 inch n\u01b0\u1edbc m\u01b0a). M\u1ed9t quy t\u1eafc g\u1ea7n \u0111\u00fang c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn l\u00e0 l\u1ea5y h\u1ec7 s\u1ed1 chuy\u1ec3n \u0111\u1ed5i b\u1eb1ng 7:1, ngh\u0129a l\u00e0 c\u1ee9 kho\u1ea3ng 7 inch tuy\u1ebft th\u00ec ch\u1ea3y ra kho\u1ea3ng 1 inch n\u01b0\u1edbc m\u01b0a. 128 T\u1ea1i sao tr\u1eddi c\u00f3 v\u1ebb r\u1ea5t t\u0129nh l\u1eb7ng sau khi m\u1ed9t tr\u1eadn tuy\u1ebft r\u01a1i? Ngay c\u1ea3 c\u00e1c con \u0111\u01b0\u1eddng trong th\u00e0nh ph\u1ed1 c\u0169ng tr\u1edf n\u00ean t\u0129nh l\u1eb7ng h\u01a1n m\u1ed9t ch\u00fat sau m\u1ed9t tr\u1eadn tuy\u1ebft r\u01a1i - \u00edt nh\u1ea5t c\u0169ng l\u00e0 v\u00e0o ban \u0111\u00eam. Nguy\u00ean nh\u00e2n l\u00e0 do l\u1edbp tr\u00ean c\u00f9ng c\u1ee7a tuy\u1ebft m\u1edbi r\u01a1i c\u1ea5u t\u1ea1o b\u1edfi c\u00e1c tinh th\u1ec3 x\u1ed1p r\u01a1i ch\u1ed3ng l\u00ean nhau, gi\u1eefa ch\u00fang kh\u00f4ng c\u00f3 g\u00ec ngo\u1ea1i tr\u1eeb kh\u00f4ng kh\u00ed, khi\u1ebfn tuy\u1ebft gi\u1ed1ng nh\u01b0 b\u1ecdt kh\u00ed. Khi b\u1ecb c\u00e1c s\u00f3ng \u00e2m t\u1eeb c\u00e1c 152","ngu\u1ed3n ti\u1ebfng \u1ed3n \u0111\u1eadp v\u00e0o, ch\u00fang s\u1ebd h\u1ea5p thu g\u1ea7n h\u1ebft c\u00e1c n\u0103ng l\u01b0\u1ee3ng \u00e2m. C\u00e1c con \u0111\u01b0\u1eddng c\u1ee9ng, xe h\u01a1i v\u00e0 m\u00e1i \u0111\u01b0\u1ee3c bao ph\u1ee7 b\u1edfi nh\u1eefng v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5 \u00e2m s\u1ebd thu \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 s\u1ef1 y\u00ean t\u0129nh t\u01b0\u01a1ng \u0111\u1ed1i, cho \u0111\u1ebfn khi nh\u1eefng \u0111\u1ee9a tr\u1ebb ra \u0111\u01b0\u1eddng ch\u01a1i \u0111\u00f9a. 129 C\u00f3 c\u01a1 s\u1edf n\u00e0o cho ki\u1ec3u d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft theo phong t\u1ee5c d\u00e2n gian l\u00e0: tr\u1eddi qu\u00e1 l\u1ea1nh \u0111\u1ec3 c\u00f3 tuy\u1ebft? Do tuy\u1ebft \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o t\u1eeb c\u00e1c tinh th\u1ec3 \u0111\u00e1, c\u00e1c tinh th\u1ec3 \u0111\u00e1 n\u00e0y h\u00ecnh th\u00e0nh t\u1ea1i b\u1ea5t k\u00ec nhi\u1ec7t \u0111\u1ed9 n\u00e0o th\u1ea5p h\u01a1n \u0111i\u1ec3m \u0111\u00f4ng \u0111\u00e1 c\u1ee7a n\u01b0\u1edbc. \u00dd ki\u1ebfn cho r\u1eb1ng, nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 qu\u00e1 th\u1ea5p \u0111\u1ec3 cho tuy\u1ebft h\u00ecnh th\u00e0nh d\u01b0\u1eddng nh\u01b0 m\u00e2u thu\u1eabn v\u1edbi khoa h\u1ecdc c\u0103n b\u1ea3n. Nh\u01b0ng m\u1ecdi ng\u01b0\u1eddi qu\u00ean m\u1ed9t \u0111i\u1ec1u l\u00e0 nhi\u1ec7t \u0111\u1ed9 ch\u01b0a ph\u1ea3i l\u00e0 \u0111i\u1ec1u ki\u1ec7n \u0111\u1ee7 \u0111\u1ec3 h\u00ecnh th\u00e0nh tuy\u1ebft, n\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1ee7 h\u01a1i \u1ea9m trong kh\u00f4ng kh\u00ed th\u00ec c\u0169ng kh\u00f4ng th\u1ec3 h\u00ecnh th\u00e0nh c\u00e1c tinh th\u1ec3 \u0111\u00e1. Khi kh\u00f4ng kh\u00ed c\u00f3 \u00e1p su\u1ea5t cao v\u00e0 kh\u00f4ng \u1ea9m th\u00ec tr\u1eddi s\u1ebd r\u1ea5t l\u1ea1nh. Cho n\u00ean, trong su\u1ed1t c\u00e1c \u0111\u1ee3t r\u00e9t \u0111\u1ed9t ng\u1ed9t, c\u00f3 th\u1ec3 \u0111\u00fang l\u00e0 \u201cqu\u00e1 l\u1ea1nh \u0111\u1ec3 c\u00f3 tuy\u1ebft\u201d v\u00e0 ch\u00fang ta ph\u1ea3i \u0111\u1ee3i cho h\u1ec7 \u00e1p su\u1ea5t th\u1ea5p, \u1ea5m v\u00e0 \u1ea9m \u01b0\u1edbt h\u01a1n \u0111\u1ebfn. N\u1ebfu m\u1ed9t h\u1ec7 nh\u01b0 th\u1ebf \u0111i theo \u0111\u1ebfn cu\u1ed1i m\u1ed9t \u0111\u1ee3t r\u00e9t \u0111\u1eadm, s\u1ebd c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng t\u1ed1t h\u01a1n cho tuy\u1ebft \u0111\u1ecdng 153","l\u1ea1i, n\u1ebfu kh\u00f4ng th\u00ec tr\u1eddi s\u1ebd m\u1ea5t v\u00e0i ng\u00e0y cho m\u1eb7t \u0111\u1ea5t \u0111\u1ee7 l\u1ea1nh \u0111\u1ec3 ng\u0103n c\u1ea3n c\u00e1c tinh th\u1ec3 tuy\u1ebft b\u1ecb tan ch\u1ea3y tr\u00ean b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac. 130 Th\u1eadt ra c\u00f3 \u0111\u00fang l\u00e0 m\u1ed7i b\u00f4ng tuy\u1ebft \u0111\u1ec1u ho\u00e0n to\u00e0n \u0111\u1ed9c nh\u1ea5t? H\u00ecnh d\u1ea1ng c\u1ee7a m\u1ed9t b\u00f4ng tuy\u1ebft l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c ph\u00e2n t\u1eed n\u01b0\u1edbc b\u00e1m quanh m\u1ed9t h\u1ea1t b\u1ee5i kh\u00ed quy\u1ec3n v\u00e0 chuy\u1ec3n th\u00e0nh b\u0103ng. V\u00ec \u0111\u00e2y l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh ho\u00e0n to\u00e0n ng\u1eabu nhi\u00ean v\u00e0 x\u1ea3y ra trong m\u1ed9t m\u00f4i tr\u01b0\u1eddng m\u00e0 nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m thay \u0111\u1ed5i li\u00ean t\u1ee5c, c\u01a1 h\u1ed9i \u0111\u1ec3 hai b\u00f4ng tuy\u1ebft gi\u1ed1ng nhau ch\u00ednh x\u00e1c l\u00e0 r\u1ea5t mong manh. T\u1ee9c l\u00e0, t\u1ea5t c\u1ea3 c\u00e1c b\u00f4ng tuy\u1ebft r\u01a1i xu\u1ed1ng v\u1edbi h\u00e0ng t\u00e1 h\u00ecnh d\u1ea1ng c\u0103n b\u1ea3n kh\u00e1c nhau, t\u1eeb d\u1ea1ng kim d\u00e0i v\u00e0 m\u1ecfng t\u1edbi c\u00e1c \u0111\u0129a ph\u1eb3ng. H\u1ea7u h\u1ebft, nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 to\u00e0n b\u1ed9, c\u00f3 n\u00e9t \u0111\u1eb7c tr\u01b0ng c\u1ee7a d\u1ea1ng \u0111\u1ed1i x\u1ee9ng s\u00e1u c\u1ea1nh quen thu\u1ed9c c\u1ee7a b\u00f4ng tuy\u1ebft th\u00f4ng th\u01b0\u1eddng, ph\u1ea3n \u00e1nh s\u1ef1 s\u1eafp x\u1ebfp l\u1ee5c gi\u00e1c c\u1ee7a ph\u00e2n t\u1eed n\u01b0\u1edbc. C\u00e1c d\u1ea1ng tr\u00f4ng \u0111\u01a1n gi\u1ea3n h\u01a1n r\u00f5 r\u00e0ng c\u00f3 m\u1ed9t c\u01a1 h\u1ed9i cao h\u01a1n \u0111\u1ec3 tr\u00f4ng gi\u1ed1ng nh\u01b0 nhau v\u00e0 trong n\u0103m 1988 t\u00e1c ph\u1ea9m Bulletin of the American Meteorological Society (T\u1eadp san c\u1ee7a h\u1ed9i kh\u00ed t\u01b0\u1ee3ng h\u1ecdc Hoa K\u1ef3) \u0111\u00e3 b\u00e1o c\u00e1o s\u1ef1 ph\u00e1t hi\u1ec7n hai b\u00f4ng tuy\u1ebft h\u00ecnh ch\u1eef nh\u1eadt r\u1ea5t gi\u1ed1ng nhau tr\u00ean m\u1ed9t m\u00e1y bay nghi\u00ean c\u1ee9u \u0111ang bang qua Wisconsin v\u00e0o th\u00e1ng 11 n\u0103m 1986. 154","131 C\u00f3 ph\u1ea3i ng\u01b0\u1eddi Eskimos th\u1eadt s\u1ef1 c\u00f3 80 t\u1eeb kh\u00e1c nhau \u0111\u1ec3 ch\u1ec9 tuy\u1ebft? D\u01b0\u1eddng nh\u01b0 ho\u00e0n to\u00e0n h\u1ee3p l\u00fd r\u1eb1ng ng\u01b0\u1eddi Eskimos s\u1ebd c\u00f3 nhi\u1ec1u t\u1eeb \u0111\u1ec3 ch\u1ec9 tuy\u1ebft, v\u00ec n\u00f3 l\u00e0 th\u1ee9 m\u00e0 h\u1ecd d\u00f9ng h\u1ea7u h\u1ebft th\u1eddi gian \u0111\u1ec3 nh\u00ecn v\u00e0o. S\u1ed1 l\u01b0\u1ee3ng t\u1eeb \u0111\u1ec3 ch\u1ec9 tuy\u1ebft c\u1ee7a ng\u01b0\u1eddi Eskimos theo c\u00e1c t\u00e0i li\u1ec7u thay \u0111\u1ed5i t\u1eeb kho\u1ea3ng n\u1eeda t\u00e1 t\u1edbi h\u01a1n 400, tuy nhi\u00ean, h\u1ea7u h\u1ebft \u0111\u1ec1u ho\u00e0n to\u00e0n v\u00f4 ngh\u0129a. R\u1eafc r\u1ed1i \u0111\u00e3 b\u1eaft \u0111\u1ea7u v\u00e0o kho\u1ea3ng n\u0103m 1940, khi Benjamin Lee Whorft, m\u1ed9t nh\u00e0 ng\u00f4n ng\u1eef h\u1ecdc nghi\u1ec7p d\u01b0, tuy\u00ean b\u1ed1 r\u1eb1ng ng\u01b0\u1eddi Eskimos nh\u1eadn bi\u1ebft \u00edt nh\u1ea5t b\u1ea3y lo\u1ea1i tuy\u1ebft kh\u00e1c nhau. L\u1eddi tuy\u00ean b\u1ed1 n\u00e0y \u0111\u00e3 tr\u1ea3i qua qu\u00e1 tr\u00ecnh truy\u1ec1n mi\u1ec7ng cho t\u1edbi khi n\u00f3 \u0111\u1ea1t t\u1edbi \u0111\u01b0\u1ee3c m\u1ed9t t\u1ec9 l\u1ec7 ph\u1ed5 bi\u1ebfn th\u1eadt l\u1ed1 b\u1ecbch. C\u00e1c nh\u00e0 ng\u00f4n ng\u1eef h\u1ecdc \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng ng\u01b0\u1eddi Eskimos th\u1ef1c s\u1ef1 c\u00f3 m\u1ed9t l\u01b0\u1ee3ng l\u1edbn t\u1eeb bi\u1ebfn th\u1ec3 c\u00f3 li\u00ean quan t\u1edbi tuy\u1ebft nh\u01b0ng ch\u00fang kh\u00f4ng ch\u1ec9 c\u00e1c d\u1ea1ng kh\u00e1c nhau c\u1ee7a tuy\u1ebft. T\u1ed5ng c\u1ed9ng c\u1ee7a ch\u00fang kh\u00f4ng nhi\u1ec1u h\u01a1n m\u1ed9t ch\u1ee5c - t\u01b0\u01a1ng t\u1ef1 v\u1edbi con s\u1ed1 \u0111\u01b0\u1ee3c nh\u1eadn th\u1ea5y trong ti\u1ebfng Anh. 155","132 B\u1eb1ng c\u00e1ch n\u00e0o c\u00e1c nh\u00e0 d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 l\u1ea1nh c\u1ee7a gi\u00f3? N\u1ed7 l\u1ef1c \u0111\u1ea7u ti\u00ean \u0111\u1ec3 \u0111\u1ecbnh l\u01b0\u1ee3ng hi\u1ec7u \u1ee9ng l\u00e0m l\u1ea1nh c\u1ee7a gi\u00f3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n n\u0103m 1939, trong lu\u1eadn \u00e1n ti\u1ebfn s\u0129 c\u1ee7a nh\u00e0 \u0111\u1ecba l\u00fd h\u1ecdc v\u00e0 khoa h\u1ecdc Paul Siple. L\u00e0m vi\u1ec7c v\u1edbi Charles Passel, \u00f4ng \u0111\u00e3 th\u1ef1c hi\u1ec7n m\u1ed9t lo\u1ea1t c\u00e1c th\u00ed nghi\u1ec7m \u1edf Nam c\u1ef1c \u0111\u1ec3 t\u00ecm hi\u1ec3u s\u1ef1 li\u00ean k\u1ebft gi\u1eefa v\u1eadn t\u1ed1c gi\u00f3 v\u00e0 nhi\u1ec7t \u0111\u1ed9 trong vi\u1ec7c t\u00e1c \u0111\u1ed9ng t\u1edbi t\u1ed1c \u0111\u1ed9 m\u1ea5t nhi\u1ec7t l\u01b0\u1ee3ng c\u1ee7a c\u01a1 th\u1ec3 con ng\u01b0\u1eddi - hay \u0111\u00fang h\u01a1n l\u00e0 c\u1ee7a c\u00e1c \u1ed1ng nh\u1ef1a ch\u1ee9a n\u01b0\u1edbc \u0111\u01b0\u1ee3c treo trong gi\u00f3 Nam c\u1ef1c. B\u1ea5t ch\u1ea5p v\u1ebb ngo\u00e0i c\u00f3 t\u00ednh h\u1ecdc thu\u1eadt, c\u00e1c ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c cho r\u1eb1ng c\u00f3 gi\u00e1 tr\u1ecb cho c\u00e1c nh\u00e0 l\u1eadp k\u1ebf ho\u1ea1ch qu\u00e2n s\u1ef1 v\u00e0 \u0111\u01b0\u1ee3c gi\u1eef b\u00ed m\u1eadt cho t\u1edbi sau Th\u1ebf chi\u1ebfn th\u1ee9 hai. Ch\u00fang c\u0169ng r\u1ea5t kh\u00f3 \u0111\u1ec3 di\u1ec5n gi\u1ea3i, v\u00ec hi\u1ec7u \u1ee9ng l\u00e0m l\u1ea1nh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ea1i di\u1ec7n cho s\u1ef1 m\u1ea5t n\u0103ng l\u01b0\u1ee3ng tr\u00ean m\u1ed9t m\u00e9t vu\u00f4ng - kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m th\u1ecbnh h\u00e0nh. N\u0103m 1973, US National Weather Service (C\u1ee5c th\u1eddi ti\u1ebft qu\u1ed1c gia c\u1ee7a Hoa K\u1ef3) \u0111\u00e3 th\u1ef1c hi\u1ec7n m\u1ed9t b\u01b0\u1edbc \u0111i hi\u1ec3n nhi\u00ean l\u00e0 ghi \u0111\u01a1n v\u1ecb gi\u00f3 l\u1ea1nh t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi nhi\u1ec7t \u0111\u1ed9: t\u1ee9c l\u00e0, nhi\u1ec7t \u0111\u1ed9 m\u00e0 m\u1ed9t ng\u01b0\u1eddi s\u1ebd c\u1ea3m th\u1ea5y khi \u0111\u01b0\u1ee3c \u0111\u1eb7t trong m\u1ed9t \u0111i\u1ec1u ki\u1ec7n n\u00e0o \u0111\u00f3, ch\u1eb3ng h\u1ea1n nh\u01b0 v\u00e0o m\u1ed9t ng\u00e0y m\u00e0 nhi\u1ec7t k\u1ebf ch\u1ec9 00C v\u00e0 c\u00f3 m\u1ed9t c\u01a1n gi\u00f3 9m\/s \u0111ang th\u1ed5i s\u1ebd l\u00e0m ta c\u1ea3m th\u1ea5y nh\u01b0 \u00e2m 140C. Kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi, vi\u1ec7c chuy\u1ec3n c\u00e1c k\u1ebft qu\u1ea3 c\u1ee7a Siple sang d\u1ea1ng d\u1ec5 hi\u1ec3u h\u01a1n s\u1ebd l\u00e0m cho c\u00e1c c\u00f4ng th\u1ee9c 156","ph\u1ee9c t\u1ea1p h\u01a1n, v\u1edbi c\u00e1c m\u1ec7nh \u0111\u1ec1 d\u1ef1a v\u00e0o v\u1eadn t\u1ed1c gi\u00f3, nhi\u1ec7t \u0111\u1ed9 kh\u00ed quy\u1ec3n v\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a c\u1ea3 hai. N\u00f3 c\u0169ng cho th\u1ea5y kh\u00f3 c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn \u0111\u00e1ng tin r\u1eb1ng tr\u1eddi l\u1ea1nh nh\u01b0 th\u1ebf n\u00e0o - nh\u1ea5t l\u00e0 v\u00ec b\u1ea3n ch\u1ea5t kh\u00f4ng th\u1ef1c t\u1ebf c\u1ee7a c\u00e1c th\u00ed nghi\u1ec7m g\u1ed1c c\u1ee7a Siple v\u00e0 Passel. Trong nh\u1eefng n\u0103m v\u1eeba qua, \u0111i\u1ec1u n\u00e0y \u0111\u00e3 k\u00edch th\u00edch c\u00e1c n\u1ed7 l\u1ef1c m\u1edbi \u0111\u1ec3 n\u1eafm b\u1eaft kh\u00e1i ni\u1ec7m gi\u00f3 l\u1ea1nh v\u00e0 n\u0103m 2001 c\u1ee5c Th\u1eddi ti\u1ebft Qu\u1ed1c Gia Hoa K\u1ef3 \u0111\u00e3 ch\u1ea5p nh\u1eadn m\u1ed9t c\u00f4ng th\u1ee9c m\u1edbi d\u1ef1a v\u00e0o c\u00e1c th\u00ed nghi\u1ec7m v\u00e0 s\u1ef1 m\u00f4 ph\u1ecfng b\u1eb1ng m\u00e1y t\u00ednh. C\u00f4ng th\u1ee9c n\u00e0y \u0111\u00e3 cho m\u1ed9t t\u00e1c \u0111\u1ed9ng l\u1ea1nh \u00edt kh\u1ee7ng khi\u1ebfp h\u01a1n, v\u1edbi m\u1ed9t c\u01a1n gi\u00f3 9m\/s l\u00e0m cho m\u1ed9t ng\u00e0y 00C c\u00f3 c\u1ea3m gi\u00e1c kho\u1ea3ng -70C, \u1ea5m h\u01a1n nhi\u1ec1u so v\u1edbi c\u00f4ng th\u1ee9c tr\u01b0\u1edbc. 133 Trong c\u00e1c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft, ch\u00fang ta nghe c\u00e1c t\u1eeb \u00e1p cao v\u00e0 \u00e1p th\u1ea5p, v\u1eady c\u00f3 \u00e1p trung n\u1eb1m gi\u1eefa hai lo\u1ea1i \u00e1p tr\u00ean kh\u00f4ng? C\u00f3 m\u1ed9t \u0111\u01b0\u1eddng ph\u00e2n chia gi\u1eefa \u00e1p su\u1ea5t cao v\u00e0 th\u1ea5p, l\u1eadp n\u00ean \u1edf \u00e1p su\u1ea5t 1 atmosphere (at). Gi\u00e1 tr\u1ecb th\u1ef1c s\u1ef1 c\u1ee7a \u00e1p su\u1ea5t \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp theo ti\u00eau chu\u1ea9n \u201cm\u00f4 h\u00ecnh tham kh\u1ea3o\u201d c\u1ee7a kh\u00ed quy\u1ec3n t\u1eeb n\u0103m 1965. Theo \u0111\u00f3 th\u00ec \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n t\u1ea1i m\u1ef1c n\u01b0\u1edbc bi\u1ec3n l\u00e0 1.013,25 milibars. \u00c1p 157","su\u1ea5t n\u00e0o cao h\u01a1n con s\u1ed1 n\u00e0y g\u1ecdi l\u00e0 \u201c\u00e1p cao\u201d, ng\u01b0\u1ee3c l\u1ea1i s\u1ebd g\u1ecdi l\u00e0 \u201c\u00e1p th\u1ea5p\u201d. V\u00e0o ng\u00e0y 31 th\u00e1ng 1 n\u0103m 1902, m\u1ed9t \u00e1p cao k\u1ec9 l\u1ee5c \u1edf Anh l\u00e0 1.054,7 millibars \u0111\u01b0\u1ee3c ghi nh\u1eadn \u1edf Aberdeen, c\u00f2n \u00e1p cao k\u1ec9 l\u1ee5c c\u1ee7a th\u1ebf gi\u1edbi \u0111\u01b0\u1ee3c ghi nh\u1eadn l\u00e0 1.083,8 mil- libars t\u1ea1i Agata, Siberia v\u00e0o ng\u00e0y 31 th\u00e1ng 12 n\u0103m 1968. 134 N\u1ebfu th\u1eddi ti\u1ebft l\u00e0 kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n, ch\u00fang ta c\u00f3 th\u1ec3 tin v\u00e0o nh\u1eefng d\u1ef1 b\u00e1o v\u1ec1 vi\u1ec7c bi\u1ebfn \u0111\u1ed5i c\u1ee7a kh\u00ed h\u1eadu kh\u00f4ng? Theo c\u00e1c nh\u00e0 kh\u00ed t\u01b0\u1ee3ng h\u1ecdc, c\u00e1c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft xa h\u01a1n 20 ng\u00e0y th\u01b0\u1eddng b\u1ecb b\u00e1c b\u1ecf b\u1edfi b\u1ea3n ch\u1ea5t \u201cb\u1ea5t \u1ed5n\u201d c\u1ee7a kh\u00ed quy\u1ec3n, trong c\u00e1c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft ch\u1ec9 c\u1ea7n m\u1ed9t sai l\u1ec7ch nh\u1ecf trong d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o, theo th\u1eddi gian, s\u1ebd ch\u00f4n v\u00f9i d\u1ef1 b\u00e1o \u0111\u00f3. Cho n\u00ean s\u1ebd sai l\u1ea7m bao nhi\u00eau trong nh\u1eefng s\u1ef1 b\u00e1o c\u1ee7a ch\u00fang ta v\u1ec1 th\u1eddi ti\u1ebft c\u1ee7a tr\u00e1i \u0111\u1ea5t trong nhi\u1ec1u th\u1eadp ni\u00ean k\u1ebf ti\u1ebfp ngay t\u1eeb b\u00e2y gi\u1edd. Qua nhi\u1ec1u n\u0103m, c\u00e2u tr\u1ea3 l\u1eddi l\u00e0 c\u00e1c d\u1ef1 b\u00e1o kh\u00ed h\u1eadu t\u1eadp trung v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 tr\u1ea3i r\u1ed9ng, nh\u01b0 nhi\u1ec7t \u0111\u1ed9 m\u00f9a h\u00e8, m\u01b0a m\u00f9a \u0111\u00f4ng v\u00e0 nh\u1eefng y\u1ebfu t\u1ed1 \u00edt nh\u1ea1y c\u1ea3m v\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c \u201cb\u1ea5t \u1ed5n\u201d. T\u1eeb \u0111\u00f3 \u0111\u01b0a \u0111\u1ebfn m\u1ed9t d\u1ef1 \u00e1n kh\u1ed5ng l\u1ed3 v\u1ec1 vi\u1ec7c l\u1eadp m\u00f4 h\u00ecnh th\u1eddi ti\u1ebft v\u00e0o th\u00e1ng 3 n\u0103m 2003. \u00dd t\u01b0\u1edfng \u1edf \u0111\u00e2y ch\u00ednh l\u00e0 v\u1eadn h\u00e0nh h\u00e0ng ng\u00e0n m\u00f4 h\u00ecnh m\u00f4 ph\u1ecfng th\u1eddi ti\u1ebft c\u1ee7a tr\u00e1i \u0111\u1ea5t, m\u1ed7i m\u00f4 h\u00ecnh c\u00f3 \u0111\u1ea7u v\u00e0o kh\u00e1c nhau m\u1ed9t ch\u00fat 158","v\u00e0 ghi nh\u1eadn xem k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng c\u1ee7a ch\u00fang kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o? Ph\u01b0\u01a1ng ph\u00e1p \u201cD\u1ef1 b\u00e1o \u0111\u1ed3ng b\u1ed9\u201d n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 \u0111o t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ef1 b\u1ea5t \u1ed5n \u0111\u1ed1i v\u1edbi c\u00e1c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft. Hi\u1ec7n nay ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111ang \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o vi\u1ec7c l\u1eadp m\u00f4 h\u00ecnh kh\u00ed h\u1eadu. N\u00f3 quan t\u00e2m xem x\u00e9t \u0111\u1ed9 l\u1edbn c\u1ee7a c\u00e1c t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ef1 b\u1ea5t \u1ed5n v\u00e0o c\u00e1c m\u00f4 h\u00ecnh th\u1eddi ti\u1ebft. 135 C\u00e1c c\u01a1n b\u00e3o l\u1edbn \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean th\u1ebf n\u00e0o? \u0110\u1ec3 nh\u1eadn bi\u1ebft, c\u00e1c c\u01a1n b\u00e3o l\u1edbn \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo m\u1ed9t danh s\u00e1ch do US Weather Service (C\u1ee5c Th\u1eddi ti\u1ebft Hoa K\u1ef3) l\u1eadp n\u00ean. Trong r\u1ea5t nhi\u1ec1u n\u0103m, t\u1ea5t c\u1ea3 c\u00e1c t\u00ean \u0111\u1eb7t cho c\u00e1c c\u01a1n b\u00e3o \u0111\u1ec1u l\u00e0 t\u00ean d\u00e0nh cho ph\u00e1i n\u1eef. Nh\u01b0ng trong m\u1ed9t cu\u1ed9c bi\u1ec3u t\u00ecnh \u0111\u00f2i b\u00ecnh quy\u1ec1n nam n\u1eef n\u0103m 1979 \u0111\u00e3 d\u1eabn \u0111\u1ebfn c\u00e1c c\u01a1n b\u00e3o nhi\u1ec7t \u0111\u1edbi d\u1eef d\u1ed9i n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo t\u1ec9 l\u1ec7 c\u00e2n b\u1eb1ng v\u1edbi t\u00ean c\u1ee7a ph\u00e1i nam (R\u00f5 r\u00e0ng l\u00e0 hi\u1ec7n nay c\u00f3 m\u1ed9t cu\u1ed9c k\u00eau g\u1ecdi s\u1eed d\u1ee5ng nhi\u1ec1u h\u01a1n c\u00e1c t\u00ean c\u1ee7a ng\u01b0\u1eddi M\u1ef9 da \u0111en). Danh s\u00e1ch \u0111\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u1ea1i v\u00e0i n\u0103m m\u1ed9t l\u1ea7n, n\u00ean c\u00f9ng m\u1ed9t t\u00ean c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u1ea1i - ngo\u1ea1i tr\u1eeb nh\u1eefng t\u00ean \u0111\u01b0\u1ee3c \u0111\u1eb7t ra \u0111\u1ec3 mi\u00eau t\u1ea3 nh\u1eefng c\u01a1n b\u00e3o l\u1edbn th\u1eadt s\u1ef1 d\u1eef d\u1ed9i, nh\u01b0 c\u01a1n b\u00e3o Hugo n\u0103m 1989 v\u00e0 Andrew n\u0103m 1992. \u0110\u00e2y l\u00e0 nh\u1eefng c\u01a1n b\u00e3o \u0111\u01b0\u1ee3c th\u1eeba nh\u1eadn l\u00e0 b\u1ea5t h\u1ee7 trong ng\u00e0nh kh\u00ed t\u01b0\u1ee3ng h\u1ecdc. 159","136 C\u00e1i g\u00ec g\u00e2y ra m\u00e0u xanh d\u01b0\u01a1ng \u0111\u1eadm c\u1ee7a nh\u1eefng t\u1ea3ng n\u01b0\u1edbc \u0111\u00e1 th\u1eadt s\u1ef1 tinh khi\u1ebft? Tuy\u1ebft th\u01b0\u1eddng c\u00f3 m\u00e0u tr\u1eafng b\u1edfi v\u00ec b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3 ph\u00e2n t\u00e1n v\u00e0 ph\u1ea3n chi\u1ebfu m\u1ed9t c\u00e1ch c\u00e2n b\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c m\u00e0u s\u1eafc l\u00e0m n\u00ean \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi. N\u1ebfu \u00e1nh s\u00e1ng b\u1eb1ng c\u00e1ch n\u00e0o \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ea5m qua b\u1ec1 m\u1eb7t tuy\u1ebft, m\u1ed9t hi\u1ec7u \u1ee9ng kh\u00e1c s\u1ebd tr\u1edf n\u00ean quan tr\u1ecdng. \u0110\u00f3 l\u00e0 c\u00e1c ph\u00e2n t\u1eed n\u01b0\u1edbc c\u00f3 khuynh h\u01b0\u1edbng h\u1ea5p thu \u00e1nh s\u00e1ng s\u00e1ng \u0111\u1ecf v\u00e0 v\u00e0ng, l\u00e0m t\u0103ng s\u1ed1 l\u01b0\u1ee3ng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a m\u00e0u xanh d\u01b0\u01a1ng trong \u00e1nh s\u00e1ng ph\u1ea3n x\u1ea1. Hi\u1ec7u \u1ee9ng n\u00e0y ch\u1ec9 \u0111\u00e1ng ch\u00fa \u00fd \u1edf m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc n\u1eb1m t\u01b0\u01a1ng \u0111\u1ed1i s\u00e2u - n\u00ean g\u1ecdi l\u00e0 \u201cm\u00e0u xanh bi\u1ec3n s\u00e2u\u201d. Trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a tuy\u1ebft v\u00e0 n\u01b0\u1edbc \u0111\u00e1, \u00e1nh s\u00e1ng n\u1ed5i l\u00ean t\u1eeb c\u00e1c l\u1ed7 ho\u1eb7c k\u1ebd n\u1ee9t \u1edf \u0111\u1ed9 s\u00e2u v\u00e0i m\u00e9t \u0111\u1ee7 \u0111\u1ec3 h\u1ea5p th\u1ee5 c\u00e1c th\u00e0nh ph\u1ea7n m\u00e0u \u0111\u1ecf v\u00e0 v\u00e0ng c\u1ee7a n\u00f3 v\u00e0 khi\u1ebfn n\u00f3 tr\u00f4ng gi\u1ed1ng nh\u01b0 ho\u00e0n to\u00e0n m\u00e0u xanh. 137 S\u1ef1 kh\u00e1c nhau gi\u1eefa \u0111\u1ed9 C (Celsius) v\u00e0 \u0111\u1ed9 b\u00e1ch ph\u00e2n (Centigrade) l\u00e0 g\u00ec? Th\u1eadt s\u1ef1, ch\u00fang kh\u00f4ng c\u00f3 g\u00ec kh\u00e1c nhau: N\u01b0\u1edbc \u0111\u00e1 tan ch\u1ea3y \u1edf 00C ho\u1eb7c 0 \u0111\u1ed9 b\u00e1ch ph\u00e2n, v\u00e0 n\u01b0\u1edbc s\u00f4i \u1edf nhi\u1ec7t \u0111\u1ed9 1000C ho\u1eb7c 100 \u0111\u1ed9 b\u00e1ch ph\u00e2n. \u0110\u1ed9 b\u00e1ch ph\u00e2n 160","(Centigrade) ngh\u0129a l\u00e0 chia th\u00e0nh tr\u0103m \u0111\u1ed9. \u0110\u1ed9 C (Celsius) l\u00e0 \u0111\u01a1n v\u1ecb nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo m\u1ed9t nh\u00e0 thi\u00ean v\u0103n h\u1ecdc Th\u1ee5y \u0110i\u1ec3n Anders Celsius v\u00e0o th\u1ebf k\u1ec9 18. Nguy\u00ean nh\u00e2n \u0111\u01a1n v\u1ecb nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00eam m\u1ed9t c\u00e1i t\u00ean nh\u01b0 v\u1eady h\u01a1i ng\u1edb ng\u1ea9n: n\u0103m 1948, m\u1ed9t \u0111\u1ed9i ng\u0169 chuy\u00ean gia qu\u1ed1c t\u1ebf kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng ch\u00fang ta \u0111ang c\u00f3 nguy c\u01a1 l\u1eabn l\u1ed9n \u201c\u0111\u1ed9 b\u00e1ch ph\u00e2n\u201d s\u1eed d\u1ee5ng cho nhi\u1ec7t \u0111\u1ed9 v\u1edbi \u201c\u0111\u1ed9\u201d th\u1ee9 m\u1ed9t tr\u0103m d\u00f9ng \u0111\u1ec3 \u0111o g\u00f3c. C\u00f3 ai nh\u1ea7m l\u1eabn gi\u1eefa hai \u0111\u01a1n v\u1ecb n\u00e0y kh\u00f4ng nh\u1ec9? 138 C\u00f3 ph\u1ea3i \u00e2m thanh truy\u1ec1n \u0111i xa h\u01a1n trong th\u1eddi ti\u1ebft n\u00f3ng? \u0110\u00fang v\u1eady, \u0111\u1eb7c bi\u1ec7t trong th\u1eddi ti\u1ebft n\u00f3ng v\u00e0 \u1ea9m. S\u00f3ng \u00e2m \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh m\u1ed7i khi c\u00f3 m\u1ed9t c\u1ed9t kh\u00f4ng kh\u00ed - ho\u1eb7c b\u1ea5t k\u00ec th\u1ee9 g\u00ec kh\u00e1c - b\u1ecb n\u00e9n \u00e9p v\u00e0 k\u00e9o c\u0103ng lu\u00e2n phi\u00ean v\u1edbi nhau. \u00c2m thanh ti\u00eau hao m\u1ed9t l\u01b0\u1ee3ng n\u0103ng l\u01b0\u1ee3ng \u0111\u1ec3 h\u00ecnh th\u00e0nh s\u1ef1 dao \u0111\u1ed9ng trong kh\u00f4ng kh\u00ed nh\u01b0ng khi \u00e2m thanh lan r\u1ed9ng ra xa, s\u00f3ng \u00e2m cu\u1ed1i c\u00f9ng s\u1ebd t\u1eaft h\u1eb3n. Ri\u00eang vi\u1ec7c s\u00f3ng \u00e2m c\u00f3 th\u1ec3 truy\u1ec1n \u0111i bao xa t\u00f9y thu\u1ed9c m\u1ee9c \u0111\u1ed9 n\u0103ng l\u01b0\u1ee3ng khi s\u00f3ng \u00e2m b\u1eaft \u0111\u1ea7u truy\u1ec1n \u0111i v\u00e0 t\u1ed1c \u0111\u1ed9 m\u00e0 s\u00f3ng \u00e2m lan \u0111i xa, v\u00e0 \u0111i\u1ec1u \u0111\u00f3 th\u00ec ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c \u0111i\u1ec1u ki\u1ec7n kh\u00ed quy\u1ec3n. 161","Th\u00f4ng th\u01b0\u1eddng, nh\u1eefng hi\u1ec7n t\u01b0\u1ee3ng li\u00ean quan \u0111\u1ebfn t\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ee7a l\u01b0u ch\u1ea5t nh\u01b0 kh\u00f4ng kh\u00ed, chi ti\u1ebft c\u1ee7a ch\u00fang th\u01b0\u1eddng r\u1ea5t ph\u1ee9c t\u1ea1p v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng tr\u1ef1c gi\u00e1c nh\u01b0ng k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng th\u00ec r\u1ea5t \u0111\u01a1n gi\u1ea3n: s\u00f3ng \u00e2m truy\u1ec1n \u0111i nhanh h\u01a1n nhi\u1ec1u khi th\u1eddi ti\u1ebft th\u1eadt s\u1ef1 \u1ea9m. T\u00e1c \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9 \u1ea9m r\u1ea5t m\u1ea1nh, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao, \u00e2m thanh truy\u1ec1n \u0111i xa h\u01a1n nhi\u1ec1u (ho\u1eb7c, n\u00f3i c\u00e1ch kh\u00e1c, s\u00f3ng \u00e2m c\u00f3 v\u1ebb nh\u01b0 \u0111\u1ebfn t\u1eeb m\u1ed9t n\u01a1i r\u1ea5t g\u1ea7n) khi \u0111\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i t\u0103ng l\u00ean kho\u1ea3ng 90% so v\u1edbi ban \u0111\u1ea7u. Ti\u1ebfng \u1ed3n m\u00e0 b\u00ecnh th\u01b0\u1eddng b\u1ea1n nghe ch\u1ec9 gi\u1ed1ng nh\u01b0 ti\u1ebfng s\u00f4i \u00e2m \u1ec9 s\u1ebd tr\u1edf n\u00ean r\u1ea5t r\u00f5, \u0111\u1eb7c bi\u1ec7t l\u00e0 ti\u1ebfng \u1ed3n ph\u00e1t ra t\u1eeb nh\u1eefng ngu\u1ed3n ri\u00eang r\u1ebd nh\u01b0 xe h\u01a1i ho\u1eb7c m\u00e1y bay. Theo UK Meteorological Office (V\u0103n ph\u00f2ng Kh\u00ed t\u01b0\u1ee3ng h\u1ecdc Anh Qu\u1ed1c), g\u1ea7n nh\u01b0 trong ng\u00e0y, \u0111\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i s\u1ebd gi\u1ea3m \u0111i kho\u1ea3ng 95% so v\u1edbi l\u00fac c\u00f3 \u0111\u1ed9 \u1ea9m cao nh\u1ea5t v\u00e0o s\u00e1ng s\u1edbm. \u0110i\u1ec1u n\u00e0y gi\u1ea3i th\u00edch r\u00f5 v\u00ec sao c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng v\u00e0 chim ch\u00f3c l\u1ea1i c\u00f3 v\u1ebb nh\u01b0 l\u00e0 nh\u1eefng v\u1eadt qu\u00e1 \u1ed3n \u00e0o tr\u01b0\u1edbc ti\u00ean trong bu\u1ed5i s\u00e1ng s\u1edbm. 139 L\u00e0m c\u00e1ch n\u00e0o c\u00e1c \u0111\u01b0\u1eddng ray xe l\u1eeda hi\u1ec7n \u0111\u1ea1i \u0111\u1ed1i ph\u00f3 \u0111\u01b0\u1ee3c v\u1edbi th\u1eddi ti\u1ebft n\u00f3ng m\u00e0 kh\u00f4ng c\u1ea7n c\u00e1c m\u1ed1i n\u1ed1i gi\u00e3n n\u1edf \u0111\u01b0\u1ee3c? Sau khi c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 v\u1eadn t\u1ed1c \u00e1p \u0111\u1eb7t l\u00ean m\u1ea1ng l\u01b0\u1edbi t\u00e0u l\u1eeda \u1edf Anh Qu\u1ed1c n\u0103m 2003 nh\u1eb1m ng\u0103n ng\u1eeba vi\u1ec7c tr\u1eadt \u0111\u01b0\u1eddng ray th\u00ec c\u00f3 v\u1ebb nh\u01b0 ch\u1eb3ng c\u00f3 c\u00e1ch n\u00e0o c\u00e1c 162","\u0111\u01b0\u1eddng ray xe l\u1eeda \u0111\u1ed1i ph\u00f3 \u0111\u01b0\u1ee3c v\u1edbi th\u1eddi ti\u1ebft n\u00f3ng. C\u00f2n n\u1eefa, m\u00f9a h\u00e8 n\u0103m 2003, ng\u01b0\u1eddi Anh c\u00f3 c\u00e1c ghi nh\u1eadn v\u1ec1 nhi\u1ec7t \u0111\u1ed9 \u0111\u1ee9t g\u00e3y m\u00e0 t\u1ea1i nhi\u1ec7t \u0111\u1ed9 \u0111\u00f3, m\u1ed9t v\u00e0i ph\u1ea7n c\u1ee7a \u0111\u01b0\u1eddng ray \u0111\u1ea1t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 520C. Cho r\u1eb1ng \u0111\u01b0\u1eddng ray xe l\u1eeda ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 \u00e2m v\u00e0o m\u00f9a \u0111\u00f4ng, li\u1ec7u m\u1ea1ng l\u01b0\u1edbi \u0111\u01b0\u1eddng ray c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng t\u1ed1t s\u1ef1 dao \u0111\u1ed9ng nhi\u1ec7t \u0111\u1ed9 qu\u00e1 l\u1edbn kh\u00f4ng. Trong c\u00e1c \u0111\u01b0\u1eddng ray ki\u1ec3u c\u0169, chi\u1ebfm kho\u1ea3ng m\u1ed9t ph\u1ea7n t\u01b0 m\u1ea1ng l\u01b0\u1edbi \u0111\u01b0\u1eddng ray Anh Qu\u1ed1c, c\u1ee9 m\u1ed7i \u0111o\u1ea1n ray d\u00e0i h\u01a1n 10m s\u1ebd c\u00f3 m\u1ed9t khe h\u1edf r\u1ed9ng kho\u1ea3ng 1cm \u0111\u1ec3 gi\u1ea3i quy\u1ebft s\u1ef1 gi\u00e3n n\u1edf c\u1ee7a \u0111\u01b0\u1eddng ray khi n\u00f3 b\u1ecb n\u00f3ng l\u00ean. C\u00e1c khe h\u1edf \u0111\u00f3 c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 gi\u00e3n n\u1edf khi d\u00e3y nhi\u1ec7t \u0111\u1ed9 dao \u0111\u1ed9ng trong kho\u1ea3ng 320C. \u0110\u01b0\u1eddng ray ki\u1ec3u m\u1edbi, c\u00f2n g\u1ecdi l\u00e0 \u0111\u01b0\u1eddng ray \u0111\u01b0\u1ee3c h\u00e0n li\u00ean t\u1ee5c (Continuously welded rail), \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t m\u1eb9o kh\u00e9o l\u00e9o trong \u0111\u00f3 c\u00e1c \u0111\u01b0\u1eddng ray th\u00e9p b\u1ecb k\u00e9o d\u00e3n khi n\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t xu\u1ed1ng v\u00e0 h\u00e0n v\u00e0o v\u1ecb tr\u00ed c\u1ed1 \u0111\u1ecbnh. S\u1ef1 k\u00e9o gi\u00e3n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0 t\u1ea1o th\u00eam kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c nguy\u00ean t\u1eed trong th\u00e9p, cho ch\u00fang c\u00f3 nhi\u1ec1u kh\u00f4ng gian \u0111\u1ec3 di chuy\u1ec3n h\u01a1n khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean - l\u00e0m gi\u1ea3m t\u1ed1c \u0111\u1ed9 gi\u00e3n n\u1edf theo nhi\u1ec7t \u0111\u1ed9 c\u1ee7a th\u00e9p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. C\u00f3 m\u1ed9t gi\u1edbi h\u1ea1n v\u1ec1 m\u1ee9c \u0111\u1ed9 k\u00e9o gi\u00e3n tr\u01b0\u1edbc c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n, v\u00ec n\u00f3 l\u00e0m gi\u1ea3m 163","hi\u1ec7u qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a th\u00e9p v\u00e0o m\u00f9a \u0111\u00f4ng nh\u01b0ng n\u00f3i chung, \u0111\u01b0\u1eddng ray \u0111\u01b0\u1ee3c h\u00e0n li\u00ean t\u1ee5c k\u00e9o d\u00e3n tr\u01b0\u1edbc ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 h\u01a1n so v\u1edbi \u0111\u01b0\u1eddng ray ki\u1ec3u c\u0169 v\u1edbi ph\u01b0\u01a1ng ph\u00e1p m\u1ed1i n\u1ed1i gi\u00e3n n\u1edf l\u1ea1c h\u1eadu. 164","M\u1ee5c l\u1ee5c NH\u1eeeNG \u0110I\u1ec0U B\u00cd \u1ea8N TRONG \u0110\u1edcI S\u1ed0NG H\u00c0NG NG\u00c0Y 1. \t T\u1ea1i sao c\u00e1c \u0111\u1ecba \u0111i\u1ec3m b\u1ea1n c\u1ea7n t\u00ecm tr\u00ean b\u1ea3n \u0111\u1ed3 \t\t th\u01b0\u1eddng hay n\u1eb1m \u1edf ph\u1ea7n r\u00eca b\u1ea3n \u0111\u1ed3?\t 5 2. \t T\u1ea1i sao khi l\u00e1i xe ta l\u1ea1i hay b\u1ecb \u0111\u1ebfn nh\u1eefng \u0111o\u1ea1n \u0111\u01b0\u1eddng \t\t c\u00f3 nhi\u1ec1u tr\u1edf ng\u1ea1i c\u00f9ng m\u1ed9t l\u00fac v\u1edbi nh\u1eefng chi\u1ebfc xe kh\u00e1c?\t 6 3.\t T\u1ea1i sao trong c\u00e1c cu\u1ed9c h\u00e0nh tr\u00ecnh, l\u00fac \u0111i kh\u1ecfi \t\t th\u01b0\u1eddng d\u00e0i h\u01a1n l\u00fac tr\u1edf v\u1ec1?\t 7 4.\t Vi\u1ec7c l\u00e0m n\u00f3ng t\u00e1ch tr\u01b0\u1edbc khi pha tr\u00e0 c\u00f3 mang l\u1ea1i l\u1ee3i \u00edch th\u1eadt s\u1ef1 n\u00e0o kh\u00f4ng?\t 8 5.\t T\u1ea1i sao ti\u1ebfng k\u00eau c\u1ee7a c\u00e1c \u1ea5m n\u01b0\u1edbc l\u1ea1i t\u1ea1m l\u1eafng xu\u1ed1ng \t\t ngay tr\u01b0\u1edbc khi n\u00f3 b\u1eaft \u0111\u1ea7u s\u00f4i?\t 9 6.\t C\u00f3 ph\u1ea3i l\u00e0m n\u01b0\u1edbc \u0111\u00e1 b\u1eb1ng n\u01b0\u1edbc s\u00f4i s\u1ebd mau \u0111\u00f4ng h\u01a1n \t\t so v\u1edbi l\u00e0m b\u1eb1ng n\u01b0\u1edbc l\u1ea1nh?\t 10 7.\t C\u00f3 c\u00e1ch n\u00e0o l\u1ea5y \u0111i \u0111\u00e1 \u0111\u00f4ng tr\u00ean k\u00ednh ch\u1eafn gi\u00f3 c\u1ee7a \t\t xe h\u01a1i m\u1ed9t c\u00e1ch nhanh ch\u00f3ng kh\u00f4ng?\t 11 8.\t C\u00e1i g\u00ec l\u00e0m cho keo si\u00eau d\u00ednh l\u1ea1i c\u00f3 kh\u1ea3 n\u0103ng \t\t d\u00ednh m\u1ea1nh nh\u01b0 v\u1eady?\t 13 9.\t T\u1ea1i sao xe \u0111\u1ea1p l\u1ea1i c\u00e2n b\u1eb1ng h\u01a1n khi n\u00f3 chuy\u1ec3n \u0111\u1ed9ng?\t15 10.\t Thanh nam ch\u00e2m c\u00f3 th\u1ec3 b\u1ecb m\u00f2n kh\u00f4ng?\t 16 11.\t T\u1ea1i sao ch\u1ec9 c\u00f3 m\u1ed9t v\u00e0i ch\u1ea5t c\u00f3 t\u00ednh t\u1eeb? \t 17 12.\t T\u1ea1i sao m\u1ed9t nam ch\u00e2m khi \u0111\u1ec3 g\u1ea7n tivi s\u1ebd sinh ra \t\t c\u00e1c m\u00e0u s\u1eafc k\u00ec \u1ea3o?\t 18 13.\t T\u1ea1i sao m\u00e0n h\u00ecnh tivi l\u1ea1i c\u00f3 c\u00e1c \u0111i\u1ec3m \u0111\u1ecf, \t\t xanh d\u01b0\u01a1ng v\u00e0 xanh l\u00e1 c\u00e2y?\t 19 165","14.\t L\u00f2 vi s\u00f3ng (l\u00f2 vi ba) c\u00f3 ph\u00e1 h\u1ee7y c\u00e1c vitamin \t\t trong th\u1ee9c \u0103n kh\u00f4ng?\t 20 15.\t T\u1ea1i sao m\u00e1u c\u00f3 m\u00e0u xanh b\u00ean d\u01b0\u1edbi da?\t 21 16.\t C\u00e1i g\u00ec khi\u1ebfn cho m\u00e1y v\u00f4 tuy\u1ebfn b\u1ecb nhi\u1ec5u \t\t khi di chuy\u1ec3n xung quanh?\t 22 17.\t T\u1ea1i sao c\u00e1c m\u00e1y bay nh\u1ecf bay c\u00f3 v\u1ebb nhanh h\u01a1n nhi\u1ec1u \t\t so v\u1edbi m\u00e1y bay ch\u1edf h\u00e0nh kh\u00e1ch l\u1edbn?\t 22 18.\t T\u1ea1i sao c\u00e1c boomerang bay v\u00f2ng tr\u1edf l\u1ea1i?\t 23 19.\t T\u1ea1i sao h\u1ea1t chanh b\u1ecf trong ru\u1ee3u gin v\u00e0 thu\u1ed1c b\u1ed5 \t\t l\u1ea1i n\u1ed5i l\u00ean v\u00e0 ch\u00ecm xu\u1ed1ng?\t 25 20.\t \u00c1p su\u1ea5t b\u00ean trong m\u1ed9t b\u00ecnh phun \t\t c\u00f3 th\u1ec3 cao \u0111\u1ebfn c\u1ee1 n\u00e0o?\t 26 21.\t L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c c\u00e1c \u0111\u01b0\u1eddng s\u1ecdc \t\t trong kem \u0111\u00e1nh r\u0103ng?\t 27 22.\t T\u1ea1i sao c\u00e1c l\u00e1 nh\u00f4m l\u1ea1i g\u00e2y \u0111au \u0111\u1edbn \t\t khi n\u00f3 ch\u1ea1m v\u00e0o c\u00e1c ch\u1ed7 tr\u00e1m r\u0103ng c\u1ee7a b\u1ea1n?\t 28 23.\t C\u00e1c tinh th\u1ec3 \u0111\u00e1 th\u1ea1ch anh gi\u00fap c\u00e1c \u0111\u1ed3ng h\u1ed3 \t\t ch\u1ea1y \u0111\u00fang gi\u1edd?\t 28 24.\t C\u00f3 ph\u1ea3i c\u00e1c gi\u00e0y tr\u01b0\u1ee3t b\u0103ng ho\u1ea1t \u0111\u1ed9ng nh\u1edd v\u00e0o \t\t \u00e1p l\u1ef1c c\u1ee7a l\u01b0\u1ee1i dao l\u00e0m tan \u0111\u00e1?\t 29 25.\t B\u1ed9 ph\u1eadn gi\u1ea3m thanh c\u1ee7a s\u00fang l\u00e0m vi\u1ec7c nh\u01b0 th\u1ebf n\u00e0o?\t30 26.\t C\u00f3 \u0111\u00fang l\u00e0 b\u00f3ng \u0111\u00e8n tr\u00f2n s\u1ebd d\u00f9ng \u0111\u01b0\u1ee3c l\u00e2u h\u01a1n \t\t n\u1ebfu b\u1ea1n lu\u00f4n \u0111\u1ec3 n\u00f3 s\u00e1ng?\t 31 27.\t T\u1ea1i sao c\u00e1c b\u00f3ng \u0111\u00e8n \u201chi\u1ec7u qu\u1ea3 \u0111i\u1ec7n n\u0103ng\u201d \t\t c\u00f3 v\u1ebb nh\u01b0 m\u1edd h\u01a1n nh\u1eefng \u0111\u00e8n cao \u00e1p?\t 32 28.\t T\u1ea1i sao xi \u0111\u00e1nh gi\u00e0y l\u00e0m cho gi\u00e0y tr\u00f4ng c\u00f3 v\u1ebb \t\t s\u00e1ng b\u00f3ng?\t 33 166","29.\t C\u00e1c vi m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 b\u1ecb m\u00f2n h\u1ebft \t\t khi d\u00f9ng qu\u00e1 l\u00e2u kh\u00f4ng?\t 34 30.\t T\u1ea1i sao lau s\u1ea1ch n\u01b0\u1edbc b\u1eb1ng gi\u1ebb \u01b0\u1edbt d\u1ec5 h\u01a1n \t\t l\u00e0 b\u1eb1ng gi\u1ebb kh\u00f4?\t 34 31.\t C\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 t\u00ecm m\u1ed9t ai \u0111\u00f3 b\u1ecb th\u1ea5t l\u1ea1c l\u00e0 g\u00ec?\t 35 32.\t Ng\u01b0\u1eddi ta l\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 d\u00e1n l\u1edbp v\u1ecf kh\u00f4ng d\u00ednh \t\t l\u00ean c\u00e1c v\u1eadt d\u1ee5ng nh\u00e0 b\u1ebfp?\t 36 33.\t \u201cM\u00f4i tr\u01b0\u1eddng b\u1ea3o qu\u1ea3n\u201d th\u1ef1c ph\u1ea9m trong si\u00eau th\u1ecb \t\t ng\u00e0y nay nh\u01b0 th\u1ebf n\u00e0o?\t 37 34.\t C\u00e1i g\u00ec g\u00e2y ra s\u1ef1 s\u1ed1c \u0111i\u1ec7n khi m\u1ed9t ng\u01b0\u1eddi \u0111i ra kh\u1ecfi \t\t m\u1ed9t chi\u1ebfc xe h\u01a1i - v\u00e0 l\u00e0m sao \u0111\u1ec3 tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00f3?\t39 35.\t T\u1ea1i sao kim lo\u1ea1i t\u00f3e l\u1eeda khi \u0111\u1eb7t trong \t\t l\u00f2 vi s\u00f3ng nh\u01b0ng c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c th\u00ec kh\u00f4ng?\t 40 36.\t C\u00f3 ph\u1ea3i c\u00e1c ch\u1ea5t l\u00e0m th\u01a1m ph\u00f2ng t\u1ed1t h\u01a1n l\u00e0 c\u00e1c\t\t kh\u1ea9u trang ng\u0103n m\u00f9i?\t 41 37.\t T\u1ea1i sao n\u01b0\u1edbc s\u1ed1t c\u00e0 chua r\u1ea5t kh\u00f3 \u0111\u1ed5 ra t\u1eeb \t\t m\u1ed9t c\u00e1i chai m\u1edbi?\t 42 38.\t T\u1ea1i sao n\u01b0\u1edbc thoa sau khi c\u1ea1o r\u00e2u th\u01b0\u1eddng g\u00e2y \t\t c\u1ea3m gi\u00e1c l\u1ea1nh tr\u00ean da?\t 42 39.\t C\u00e1i g\u00ec khi\u1ebfn cho s\u1eefa \u0111un b\u1eb1ng l\u00f2 vi s\u00f3ng \t\t tr\u00e0o ra kh\u1ecfi n\u1ed3i?\t 43 40.\t T\u1ea1i sao th\u01b0\u1eddng c\u00f3 m\u1ed9t c\u01a1n gi\u00f3 r\u1ea5t l\u1edbn \t\t th\u1ed5i quanh c\u00e1c kh\u1ed1i cao \u1ed1c?\t 44 41.\t Li\u1ec7u m\u1ed9t t\u1ea5m g\u01b0\u01a1ng c\u00f3 th\u1ec3 ph\u1ea3n chi\u1ebfu c\u00e1c v\u1eadt \t\t kh\u00f4ng n\u1eb1m tr\u1ef1c ti\u1ebfp ngay tr\u01b0\u1edbc m\u1eb7t g\u01b0\u01a1ng kh\u00f4ng?\t 45 42.\t T\u1ea1i sao nh\u1eefng c\u00e1i c\u00e2n cho ra nh\u1eefng ch\u1ec9 s\u1ed1 kh\u00e1c nhau \t\t khi \u0111\u1eb7t tr\u1ef1c ti\u1ebfp tr\u00ean m\u1eb7t s\u00e0n c\u1ee9ng v\u00e0 khi \u0111\u1eb7t tr\u00ean \t\t c\u00e1c t\u1ea5m th\u1ea3m?\t 46 43.\t X\u00e0 ph\u00f2ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?\t 47 167","44.\t T\u1ea1i sao c\u00e1c c\u00e1c c\u1ee7 h\u00e0nh khi\u1ebfn m\u1eaft b\u1ea1n b\u1ecb cay \t\t v\u00e0 ph\u1ea3i l\u00e0m g\u00ec \u0111\u1ec3 tr\u00e1nh chuy\u1ec7n \u0111\u00f3?\t 49 45.\t \u0110i\u1ec1u b\u00ed m\u1eadt c\u1ee7a nh\u1eefng c\u00e1i \u0111\u00e8n b\u00e0n s\u00e1ng l\u00ean \t\t khi b\u1ecb ch\u1ea1m v\u00e0o l\u00e0 g\u00ec?\t 50 46.\t T\u1ea1i sao n\u01b0\u1edbc l\u1ea1i gi\u00e3n n\u1edf khi \u1edf d\u01b0\u1edbi 40C trong khi \t\t h\u1ea7u h\u1ebft c\u00e1c ch\u1ea5t kh\u00e1c ti\u1ebfp t\u1ee5c co l\u1ea1i?\t 51 B\u00cd \u1ea8N C\u1ee6A S\u1ef0 S\u1ed0NG V\u00c0 C\u00c1I CH\u1ebeT 47.\t C\u00f3 ph\u1ea3i khi th\u1eddi ti\u1ebft \u1ea9m \u01b0\u1edbt v\u00e0 l\u1ea1nh s\u1ebd l\u00e0m t\u0103ng \t\t nguy c\u01a1 b\u1ecb c\u1ea3m l\u1ea1nh?\t 52 48.\t C\u00e1c vi\u00ean k\u1ebdm c\u00f3 th\u1eadt s\u1ef1 tr\u1ecb \u0111\u01b0\u1ee3c b\u1ec7nh c\u1ea3m l\u1ea1nh \t\t th\u00f4ng th\u01b0\u1eddng kh\u00f4ng?\t 53 49.\t M\u1ea5t bao l\u00e2u \u0111\u1ec3 t\u1ec9nh t\u00e1o tr\u1edf l\u1ea1i sau khi u\u1ed1ng say?\t 54 50.\t \u0110i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng c\u00f3 th\u1ec3 khi\u1ebfn cho c\u00e1c kh\u1edbp n\u1ed1i \t\t nh\u00e2n t\u1ea1o b\u1ecb \u0111au kh\u00f4ng?\t 56 51.\t Li\u1ec7u ph\u00e9p ch\u1eefa vi l\u01b0\u1ee3ng \u0111\u1ed3ng c\u0103n c\u00f3 t\u00e1c d\u1ee5ng kh\u00f4ng?\t 56 52.\t Thu\u1ed1c kh\u00e1ng sinh di\u1ec7t tr\u1eeb vi khu\u1ea9n nh\u01b0 th\u1ebf n\u00e0o?\t 59 53.\t T\u1ea1i sao s\u1ef1 l\u00ean c\u01a1n \u0111\u1ed9ng kinh th\u01b0\u1eddng di\u1ec5n ra \t\t v\u00e0o nh\u1eefng l\u00fac tr\u0103ng tr\u00f2n?\t 60 54.\t C\u00e1i g\u00ec g\u00e2y ra s\u1ef1 x\u00f3c h\u00f4ng khi ch\u1ea1y?\t 60 55.\t \u0110i\u1ec1u g\u00ec x\u1ea3y ra v\u1edbi th\u1ee9c \u0103n \u0111\u01b0\u1ee3c chi\u1ebfu b\u1ee9c x\u1ea1?\t 61 56.\t T\u1ea1i sao mu\u1ed7i kh\u00f4ng th\u1ec3 truy\u1ec1n b\u1ec7nh AIDS?\t 62 57.\t T\u1ea1i sao c\u00e1c lo\u1ea1i n\u01b0\u1edbc r\u01b0\u1ee3u pha tr\u1ed9n v\u1edbi nhau \t\t th\u01b0\u1eddng g\u00e2y c\u1ea3m gi\u00e1c b\u1ecb kh\u00f3 ch\u1ecbu n\u1eb7ng sau khi u\u1ed1ng?\t63 58.\t C\u00f3 ch\u1ee9ng c\u1ee9 n\u00e0o cho th\u1ea5y ng\u01b0\u1eddi \u0103n chay \t\t kh\u1ecfe m\u1ea1nh h\u01a1n ng\u01b0\u1eddi \u0103n m\u1eb7n kh\u00f4ng?\t 64 168","59.\t C\u00f3 ph\u1ea3i ph\u1ee5 n\u1eef th\u01b0\u1eddng s\u1ed1ng l\u00e2u h\u01a1n \u0111\u00e0n \u00f4ng?\t 66 60.\t Vi\u1ec7c t\u01b0 v\u1ea5n sau m\u1ed9t ch\u1ea5n \u0111\u1ed9ng t\u00e2m l\u00fd \t\t c\u00f3 th\u1ef1c s\u1ef1 \u00edch l\u1ee3i kh\u00f4ng?\t 67 61.\t Th\u1ef1c ph\u1ea9m b\u00e9o c\u00f3 th\u1eadt s\u1ef1 g\u00e2y ra m\u1ee5n tr\u1ee9ng c\u00e1 kh\u00f4ng?\t 68 62.\t C\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 tr\u00e1nh m\u1ec7t m\u1ecfi \t\t sau khi \u0111i m\u00e1y bay l\u00e0 g\u00ec?\t 69 63.\t T\u1ea1i sao d\u1ecbch d\u1ea1 d\u00e0y kh\u00f4ng ti\u00eau h\u00f3a lu\u00f4n c\u1ea3 d\u1ea1 d\u00e0y?\t 71 64.\t C\u00e1i g\u00ec l\u00e0m cho c\u00e1c v\u1ebft b\u1ea7m c\u00f3 m\u00e0u \u0111\u1eb7c bi\u1ec7t nh\u01b0 th\u1ebf?7\t 1 65.\t \u0110\u1ecdc s\u00e1ch trong \u00e1nh s\u00e1ng y\u1ebfu c\u00f3 l\u00e0m t\u1ed5n th\u01b0\u01a1ng \t\t m\u1eaft kh\u00f4ng?\t 72 66.\t C\u00f3 \u0111\u00fang l\u00e0 n\u1ed3i nh\u00f4m c\u00f3 th\u1ec3 g\u00e2y ra \t\t b\u1ec7nh Alzheimer kh\u00f4ng?\t 73 67.\t C\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 \u0111\u1ed1t ch\u00e1y calori khi \u0111ang tr\u00ean \t\t \u0111\u01b0\u1eddng \u0111i l\u00e0m l\u00e0 g\u00ec?\t 74 68.\t M\u00f3n \u0103n n\u00e0o l\u00e0m b\u1ea1n t\u1ed1n nhi\u1ec1u calori h\u01a1n c\u1ea3 l\u01b0\u1ee3ng \t\t do n\u00f3 cung c\u1ea5p?\t 75 69.\t U\u1ed1ng b\u1eb1ng nh\u1eefng ly pha l\u00ea c\u00f3 ch\u00ec c\u00f3 nguy hi\u1ec3m kh\u00f4ng?\t 77 70.\t B\u1ec7nh phong c\u00f3 l\u00e2y kh\u00f4ng?\t 78 71.\t C\u00f3 \u0111\u00fang l\u00e0 \u0103n c\u00e0 r\u1ed1t s\u1ebd t\u1ed1t cho m\u1eaft kh\u00f4ng?\t 79 72.\t Ta c\u00f3 th\u1ec3 b\u1ecb l\u00e2y ung th\u01b0 t\u1eeb ng\u01b0\u1eddi kh\u00e1c hay kh\u00f4ng?\t 80 73.\t C\u00f3 ph\u1ea3i c\u00e1c v\u00f2ng \u0111eo tay b\u1eb1ng \u0111\u1ed3ng hay \t\t v\u00f2ng t\u1eeb t\u00ednh c\u00f3 t\u00e1c d\u1ee5ng ch\u1ed1ng l\u1ea1i c\u00e1c r\u1ed1i lo\u1ea1n?\t 81 74.\t Khi \u0111ang \u1edf trong xe h\u01a1i, v\u1edbi c\u1eeda k\u00ednh \u0111\u00f3ng, \t\t b\u1ea1n c\u00f3 th\u1ec3 b\u1ecb r\u00e1m n\u1eafng hay kh\u00f4ng?\t 83 169","NH\u1eeeNG NI\u1ec0M TIN V\u00c0 \u0110I\u1ec0U TH\u1ea6N B\u00cd 75.\t C\u00f3 b\u1eb1ng ch\u1ee9ng khoa h\u1ecdc n\u00e0o cho s\u1ef1 \u0111\u1ea7u thai kh\u00f4ng?8\t 4 76.\t C\u00f3 \u0111\u00fang l\u00e0 n\u01b0\u1edbc ch\u1ea3y ra kh\u1ecfi b\u1ed3n r\u1eeda ch\u00e9n theo \t\t chi\u1ec1u ng\u01b0\u1ee3c chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3 khi \u1edf B\u1eafc b\u00e1n c\u1ea7u?\t 87 77.\t C\u00e1c ca s\u0129 opera c\u00f3 th\u1ec3 l\u00e0m v\u1ee1 nh\u1eefng ly r\u01b0\u1ee3u \t\t b\u1eb1ng c\u00e1ch h\u00e9t l\u00ean kh\u00f4ng ?\t 88 78.\t C\u00e1c c\u1eeda s\u1ed5 c\u0169 c\u00f3 ph\u1ea7n \u0111\u00e1y d\u00e0y h\u01a1n v\u00ec th\u1ee7y tinh \t\t c\u0169ng b\u1ecb ch\u1ea3y gi\u1ed1ng nh\u01b0 si r\u00f4?\t 90 79.\t \u0110\u00e3 c\u00f3 ai th\u00e0nh c\u00f4ng trong vi\u1ec7c t\u1ea1o ra m\u1ed9t d\u1ea1ng \t\t s\u1ed1ng m\u1edbi kh\u00f4ng?\t 91 80.\t C\u00f3 th\u1ee9 thu\u1ed1c \u201cn\u00f3i s\u1ef1 th\u1eadt\u201d n\u00e0o hi\u1ec7u qu\u1ea3 100% kh\u00f4ng?\t92 81.\t Vi\u1ec7c qu\u1ea3ng c\u00e1o ti\u1ec1m th\u1ee9c c\u00f3 hi\u1ec7u qu\u1ea3 kh\u00f4ng?\t 94 82.\t C\u00e1c b\u1ed9 l\u1ea1c l\u00e0m n\u00ean \u201c\u0111\u1ea7u teo\u201d (shrunken head) \t\t nh\u01b0 th\u1ebf n\u00e0o?\t 95 83.\t C\u00f3 \u0111\u00fang l\u00e0 s\u1eed d\u1ee5ng Internet l\u00e0 kh\u00f4ng kh\u00f4n ngoan \t\t khi \u0111ang c\u00f3 m\u01b0a b\u00e3o s\u1ea5m s\u00e9t?\t 96 84.\t C\u00f3 ph\u1ea3i ch\u00e2n ph\u1ea3i d\u1ec5 b\u1ecb nh\u1ed9t h\u01a1n ch\u00e2n tr\u00e1i kh\u00f4ng?\t 97 85.\t C\u00e1c nh\u00e0 khoa h\u1ecdc c\u00f3 t\u00ecm th\u1ea5y \u201cm\u1ed1i li\u00ean k\u1ebft \u0111\u00e3 m\u1ea5t\u201d \t\t gi\u1eefa ch\u00fang ta v\u00e0 tinh tinh ch\u01b0a?\t 98 86.\t C\u00f3 nh\u1eefng b\u1eb1ng ch\u1ee9ng n\u00e0o v\u1ec1 m\u1ed9t m\u1ed1i ki\u00ean k\u1ebft \t\t \u0111\u1eb7c bi\u1ec7t gi\u1eefa hai sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng hay kh\u00f4ng?\t 99 87.\t Ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 \u201ct\u1ef1 b\u00f9ng ch\u00e1y\u201d nh\u01b0 th\u1ebf n\u00e0o?\t 100 88.\t C\u00f3 ph\u1ea3i ch\u00fang ta m\u1ea5t 20% th\u00e2n nhi\u1ec7t qua \u0111\u1ea7u \t\t c\u1ee7a ch\u00fang ta kh\u00f4ng?\t 102 89.\t C\u00f3 \u0111\u00fang l\u00e0 \u00e1o gil\u00ea s\u1ee3i t\u1ed1t h\u01a1n l\u00e0 \u00e1o gil\u00ea b\u00ecnh th\u01b0\u1eddng kh\u00f4ng?\t 103 90.\t B\u1ed9 n\u00e3o c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 b\u1ecb t\u1ed5n th\u01b0\u01a1ng khi b\u1ea1n \t\t suy ngh\u0129 qu\u00e1 nhanh kh\u00f4ng?\t 103 170","91.\t C\u00f3 th\u1eadt l\u00e0 n\u00fai Everest kh\u00f4ng ph\u1ea3i l\u00e0 \u0111i\u1ec3m cao nh\u1ea5t \t\t tr\u00ean tr\u00e1i \u0111\u1ea5t?\t 104 92.\t T\u1ea1i sao khi cho m\u1ed9t c\u00e1i mu\u1ed7ng v\u00e0o m\u1ed9t chai r\u01b0\u1ee3u \t\t s\u1ee7i b\u1ecdt th\u00ec gi\u00fap gi\u1eef l\u1ea1i b\u1ecdt kh\u00ed?\t 105 93.\t C\u00f3 th\u1eadt l\u00e0 ch\u00fang ta th\u01b0\u1eddng ch\u1ec9 d\u00f9ng 10% b\u1ed9 n\u00e3o \t\t c\u1ee7a m\u00ecnh kh\u00f4ng?\t 106 94.\t Li\u1ec7u b\u1ea1n c\u00f3 th\u1ec3 \u0111i v\u00f2ng quanh th\u1ebf gi\u1edbi b\u1eb1ng c\u00e1ch\t\t bay th\u1eb3ng l\u00ean trong m\u1ed9t chi\u1ebfc tr\u1ef1c th\u0103ng v\u00e0 \u0111\u1ee3i \t\t \u0111i\u1ec3m \u0111\u1ebfn c\u1ee7a b\u1ea1n t\u1ef1 \u0111\u1ebfn b\u00ean d\u01b0\u1edbi b\u1ea1n kh\u00f4ng?\t 106 95.\t T\u1ea5t c\u1ea3 nh\u1eefng chi\u1ebfc v\u1edb l\u1ebb \u0111\u00e3 bi\u1ebfn \u0111i \u0111\u00e2u?\t 107 96.\t T\u1ea1i sao rau bina (rau ch\u00e2n v\u1ecbt) l\u1ea1i r\u1ea5t t\u1ed1t cho s\u1ee9c kh\u1ecfe?\t 109 97.\t L\u00ed do \u0111\u1eb1ng sau vi\u1ec7c s\u1eed d\u1ee5ng d\u1ea5m \u0111\u1ec3 ch\u1eefa v\u1ebft ch\u00edch \t\t c\u1ee7a ong b\u1eafp c\u00e0y l\u00e0 g\u00ec?\t 109 98.\t C\u00f3 th\u1eadt l\u00e0 d\u00e2n s\u1ed1 th\u1ebf gi\u1edbi hi\u1ec7n nay nhi\u1ec1u h\u01a1n l\u00e0 \t\t t\u1ea5t c\u1ea3 nh\u1eefng ng\u01b0\u1eddi \u0111\u00e3 t\u1eebng s\u1ed1ng?\t 110 99.\t C\u00f3 ph\u1ea3i c\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 tr\u00e1ch b\u1ecb s\u00e9t \u0111\u00e1nh l\u00e0 \t\t n\u1eb1m d\u00e0i tr\u00ean m\u1eb7t \u0111\u1ea5t kh\u00f4ng?\t 111 CH\u1eee S\u1ed0, TR\u00d2 CH\u01a0I V\u00c0 C\u00c1C TR\u00d2 GI\u1ea2I TR\u00cd 100.\tPh\u01b0\u01a1ng c\u00e1ch nh\u1edb m\u00e3 PIN t\u1ed1t?\t 113 101.\tT\u1ea1i sao nh\u00e2n hai s\u1ed1 \u00e2m v\u1edbi nhau cho ra k\u1ebft qu\u1ea3 \t\t l\u00e0 m\u1ed9t s\u1ed1 d\u01b0\u01a1ng?\t 114 102.\tT\u1ea1i sao nhi\u1ec1u s\u1ef1 vi\u1ec7c \u0111\u01b0\u1ee3c nh\u1eadn \u0111\u1ecbnh chung qua \t\t t\u1ec9 l\u1ec7 ph\u00e2n chia 80\/20?\t 116 103.\tC\u00f3 \u0111\u00fang l\u00e0 kh\u00f4ng th\u1ec3 ch\u1ee9ng minh m\u1ed9t m\u1ec7nh \u0111\u1ec1 \t\t ph\u1ee7 \u0111\u1ecbnh kh\u00f4ng?\t 118 171","104.\tS\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 th\u1ec3 l\u00e0 s\u1ed1 n\u00e0o?\t 120 105.\tKhi c\u00e1c \u0111\u1ed3ng xu \u0111\u01b0\u1ee3c tung l\u00ean, t\u1ec9 l\u1ec7 c\u00f9ng xu\u1ea5t hi\u1ec7n \t\t m\u1eb7t ng\u1eeda l\u00e0 bao nhi\u00eau?\t 121 106.\tC\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u1ed3ng xu \u0111\u01b0\u1ee3c tung l\u00ean \t\t s\u1ebd r\u1edbt xu\u1ed1ng \u0111\u1ea5t v\u1edbi m\u1eb7t n\u00e0o kh\u00f4ng?\t 122 107.\tL\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 m\u1ed9t ng\u01b0\u1eddi c\u00f3 th\u1ec3 m\u01b0\u1eddng t\u01b0\u1ee3ng \t\t ra con s\u1ed1 m\u1ed9t tri\u1ec7u?\t 123 108.\tS\u1ed1 l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \t\t trong khoa h\u1ecdc l\u00e0 g\u00ec?\t 125 109.\tT\u1ea1i sao c\u00e1c nh\u00e0 to\u00e1n h\u1ecdc l\u1ea1i r\u1ea5t h\u1ee9ng th\u00fa v\u1edbi \t\t c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1?\t 126 110.\tT\u1ea1i sao ng\u01b0\u1eddi ta l\u1ea1i nh\u1ea5n m\u1ea1nh \u0111\u1ebfn con s\u1ed1 \u201ctrung gian\u201d (median) thay v\u00ec d\u00f9ng s\u1ed1 trung b\u00ecnh (average)?\t 127 111.\tC\u00f3 \u0111\u00fang r\u1eb1ng ch\u1ec9 c\u1ea7n c\u00f3 23 ng\u01b0\u1eddi trong m\u1ed9t c\u0103n \t\t ph\u00f2ng, ch\u1eafc ch\u1eafn s\u1ebd c\u00f3 hai ng\u01b0\u1eddi c\u00f3 c\u00f9ng ng\u00e0y sinh?\t 128 112.\tL\u00e0m c\u00e1ch n\u00e0o c\u00e1c nh\u00e0 to\u00e1n h\u1ecdc c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c \t\t s\u1ed1 pi \u0111\u1ebfn h\u00e0ng t\u1ec9 ch\u1eef s\u1ed1 sau d\u1ea5u th\u1eadp ph\u00e2n?\t 130 113.\tT\u1ea1i sao c\u00e1c \u0111\u1ed3ng h\u1ed3 \u0111\u01b0\u1ee3c quay l\u00f9i 1 gi\u1edd v\u00e0o th\u1eddi \u0111i\u1ec3m tr\u01b0\u1edbc ng\u00e0y h\u1ea1 ch\u00ed (ng\u00e0y ng\u1eafn nh\u1ea5t) trong n\u0103m v\u00e0 quay nhanh 1 gi\u1edd v\u00e0o 3 th\u00e1ng sau ng\u00e0y h\u1ea1 ch\u00ed \u0111\u00f3?\t 132 114.\tT\u1ea1i sao kho\u1ea3ng c\u00e1ch ng\u1eafn nh\u1ea5t gi\u1eefa hai \u0111i\u1ec3m \t\t l\u1ea1i l\u00e0 m\u1ed9t \u0111o\u1ea1n th\u1eb3ng?\t 133 115.\tT\u1ea1i sao v\u00f2ng tr\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c chia th\u00e0nh 360 \u0111\u1ed9?\t 134 116.\tLi\u1ec7u c\u00e1c th\u1ee7 m\u00f4n c\u00f3 c\u01a1 h\u1ed9i n\u00e0o \u0111\u1ec3 b\u1eaft \u0111\u01b0\u1ee3c \t\t c\u00e1c qu\u1ea3 ph\u1ea1t \u0111\u1ec1n hay kh\u00f4ng?\t 135 117.\tT\u1ea1i sao nh\u1eefng l\u1ed7 nh\u1ecf tr\u00ean c\u00e1c tr\u00e1i banh golf \t\t gi\u00fap cho ch\u00fang bay xa h\u01a1n?\t 137 118.\tL\u00e0m th\u1ebf n\u00e0o m\u00e0 tr\u00e1i banh c\u00f3 th\u1ec3 \u0111i l\u1ec7ch h\u01b0\u1edbng \t\t 172","khi \u0111ang bay?\t 138 119.\tV\u00ec sao c\u00e1c m\u1ea3nh v\u00e1 tr\u00ean b\u1ec1 m\u1eb7t tr\u00e1i banh \t\t l\u1ea1i c\u00f3 d\u1ea1ng ng\u0169 gi\u00e1c v\u00e0 l\u1ee5c gi\u00e1c?\t 141 120.\t\u0110\u00e2u l\u00e0 nguy\u00ean nh\u00e2n c\u1ee7a \u201cl\u1ee3i th\u1ebf s\u00e2n nh\u00e0\u201d \t\t trong b\u00f3ng \u0111\u00e1?\t 142 121.\tC\u00f3 l\u00fd do n\u00e0o \u0111\u1ec3 gi\u1ea3i th\u00edch cho vi\u1ec7c t\u1ea1i sao l\u1ea1i c\u00f3 r\u1ea5t \t\t nhi\u1ec1u quy\u1ebft \u0111\u1ecbnh sai v\u1ec1 l\u1ed7i vi\u1ec7t v\u1ecb trong b\u00f3ng \u0111\u00e1 kh\u00f4ng?\t 144 KH\u00cd T\u01af\u1ee2NG H\u1eccC 122.\tKhi b\u1ecb m\u1eafc m\u01b0a, b\u1ea1n n\u00ean \u0111i b\u1ed9 hay ch\u1ea1y?\t 146 123.\tTh\u1eddi \u0111i\u1ec3m n\u00e0o l\u00e0 n\u00f3ng nh\u1ea5t trong ng\u00e0y?\t 147 124.\tT\u1ea1i sao \u0111\u00f4i khi b\u1ea1n th\u1ea5y \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n m\u1ed9t c\u1ea7u v\u1ed3ng?\t 147 125.\tC\u00f3 th\u1ec3 l\u00e1i xe xuy\u00ean qua qua ph\u1ea7n cu\u1ed1i c\u1ee7a \t\t c\u1ea7u v\u1ed3ng kh\u00f4ng?\t 149 126.\tT\u1ea1i sao \u00e1nh s\u00e1ng c\u1ee7a m\u1ed9t th\u1ecb tr\u1ea5n \u1edf xa \u0111\u00f4i khi \t\t l\u1ea1i l\u1ea5p l\u00e1nh?\t 150 127.\tM\u1ed9t inch tuy\u1ebft b\u1eb1ng kho\u1ea3ng bao nhi\u00eau n\u01b0\u1edbc m\u01b0a?\t 151 128.\tT\u1ea1i sao tr\u1eddi c\u00f3 v\u1ebb r\u1ea5t t\u0129nh l\u1eb7ng sau khi \t\t m\u1ed9t tr\u1eadn tuy\u1ebft r\u01a1i?\t 152 129.\tC\u00f3 c\u01a1 s\u1edf n\u00e0o cho ki\u1ec3u d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft theo \t\t phong t\u1ee5c d\u00e2n gian l\u00e0: tr\u1eddi qu\u00e1 l\u1ea1nh \u0111\u1ec3 c\u00f3 tuy\u1ebft?\t 153 130.\tTh\u1eadt ra c\u00f3 \u0111\u00fang l\u00e0 m\u1ed7i b\u00f4ng tuy\u1ebft \u0111\u1ec1u ho\u00e0n to\u00e0n \t\t \u0111\u1ed9c nh\u1ea5t?\t 154 131.\tC\u00f3 ph\u1ea3i ng\u01b0\u1eddi Eskimos th\u1eadt s\u1ef1 c\u00f3 80 t\u1eeb kh\u00e1c nhau \t\t \u0111\u1ec3 ch\u1ec9 tuy\u1ebft?\t 155 173","132.\tB\u1eb1ng c\u00e1ch n\u00e0o c\u00e1c nh\u00e0 d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft \u01b0\u1edbc l\u01b0\u1ee3ng \t\t \u0111\u1ed9 l\u1ea1nh c\u1ee7a gi\u00f3?\t 156 133.\tTrong c\u00e1c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft, ch\u00fang ta nghe c\u00e1c t\u1eeb \t\t \u00e1p cao v\u00e0 \u00e1p th\u1ea5p, v\u1eady c\u00f3 \u00e1p trung n\u1eb1m gi\u1eefa \t\t hai lo\u1ea1i \u00e1p tr\u00ean kh\u00f4ng?\t 157 134.\tN\u1ebfu th\u1eddi ti\u1ebft l\u00e0 kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n, ch\u00fang ta c\u00f3 th\u1ec3 tin v\u00e0o nh\u1eefng d\u1ef1 b\u00e1o v\u1ec1 vi\u1ec7c bi\u1ebfn \u0111\u1ed5i c\u1ee7a kh\u00ed h\u1eadu kh\u00f4ng?\t 158 135.\tC\u00e1c c\u01a1n b\u00e3o l\u1edbn \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean th\u1ebf n\u00e0o?\t 159 136.\tC\u00e1i g\u00ec g\u00e2y ra m\u00e0u xanh d\u01b0\u01a1ng \u0111\u1eadm c\u1ee7a nh\u1eefng \t\t t\u1ea3ng n\u01b0\u1edbc \u0111\u00e1 th\u1eadt s\u1ef1 tinh khi\u1ebft?\t 160 137.\tS\u1ef1 kh\u00e1c nhau gi\u1eefa \u0111\u1ed9 C (Celsius) v\u00e0 \u0111\u1ed9 b\u00e1ch ph\u00e2n (Centigrade) l\u00e0 g\u00ec?\t 160 138.\tC\u00f3 ph\u1ea3i \u00e2m thanh truy\u1ec1n \u0111i xa h\u01a1n trong th\u1eddi ti\u1ebft n\u00f3ng?\t 161 139.\tL\u00e0m c\u00e1ch n\u00e0o c\u00e1c \u0111\u01b0\u1eddng ray xe l\u1eeda hi\u1ec7n \u0111\u1ea1i \u0111\u1ed1i ph\u00f3 \t\t \u0111\u01b0\u1ee3c v\u1edbi th\u1eddi ti\u1ebft n\u00f3ng m\u00e0 kh\u00f4ng c\u1ea7n c\u00e1c m\u1ed1i n\u1ed1i \t\t gi\u00e3n n\u1edf \u0111\u01b0\u1ee3c?\t 162 174","h\u00e3y tr\u1ea3 l\u1eddi em t\u1ea1i sao? t\u1eadp 11 robert matthews Hu\u1ef3nh Thu H\u01b0\u01a1ng d\u1ecbch Ch\u1ecbu tr\u00e1ch nhi\u1ec7m xu\u1ea5t b\u1ea3n: ts. qu\u00e1ch thu nguy\u1ec7t Bi\u00ean t\u1eadp: thu nhi B\u00eca: b\u00f9i nam S\u1eeda b\u1ea3n in: nh\u1eadt vi K\u0129 thu\u1eadt vi t\u00ednh: v\u0169 ph\u01b0\u1ee3ng NH\u00c0 XU\u1ea4T B\u1ea2N TR\u1eba 161B L\u00fd Ch\u00ednh Th\u1eafng - Qu\u1eadn 3 - Th\u00e0nh ph\u1ed1 H\u1ed3 Ch\u00ed Minh \u0110T: 39316289 - 39316211 - 38465595 - 38465596 - 39350973 Fax: 84.8.38437450 - E-mail: nxbtre@ hcm.vnn.vn Website: http:\/\/www.nxbtre.com.vn Chi nh\u00e1nh nh\u00e0 xu\u1ea5t b\u1ea3n tr\u1ebb t\u1ea1i H\u00e0 N\u1ed9i 20 ng\u00f5 91, Nguy\u1ec5n Ch\u00ed Thanh, Qu\u1eadn \u0110\u1ed1ng \u0110a - H\u00e0 N\u1ed9i \u0110T & Fax: (04) 37734544 E-mail: vanphongnxbtre@ hn.vnn.vn 175"]