What are the most fascinating science facts?
有什么最吸引人的科學(xué)事實(shí)？

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獲得12.3k好評(píng)的回答@Alyanna Rosales：

The existence of gravity.
重力的存在。

1.The reason why flames are going upward is that cold air sinks because of gravity which then results to hot air rising. But if there were no gravity, flames would look like this:
1.火苗向上是因?yàn)槭苤亓τ绊懤淇諝庀鲁?，熱空氣上升。但如果沒(méi)有重力，火苗就是這樣：

2.Without gravity bacteria gets tougher. A research shows that salmonella can get 3 times stronger in microgravity. Good thing we have gravity!
2.沒(méi)有重力的話細(xì)菌會(huì)更難對(duì)付。一項(xiàng)研究顯示失重狀態(tài)下沙門(mén)氏菌會(huì)強(qiáng)大3倍，真慶幸我們有重力！

3.And lastly, Newton wasn't hit by an apple. He only saw an apple fall to the ground.
3.最后，牛頓并沒(méi)有被蘋(píng)果砸中，他只是看見(jiàn)一個(gè)蘋(píng)果掉在地上。

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獲得4.5k好評(píng)的回答@Amandeep Litt：

1. One eye blink needs movement of about 200 muscles
1.一個(gè)眼睛眨動(dòng)需要牽動(dòng)約200個(gè)肌肉

2. Every drop of blood in your body is filtered over 300 times in a day
2.身體里每滴血每天都要被過(guò)濾超過(guò)300次

3. 20 minutes a day outside in a good weather boosts good mood, broadens thinking and improves productivity
3.天氣好時(shí)一天在戶外20分鐘能愉悅心情、拓寬思路并提高工作效率

4. Happiness is maximized at 13.9 degrees Celsius
4.快樂(lè)會(huì)在13.9攝氏度時(shí)最大化

5. Surface area of a human lung is equal to a tennis court
5.人一個(gè)肺部的表面積相當(dāng)于一個(gè)網(wǎng)球場(chǎng)

6. It is impossible to tickle yourself.
6.胳肢自己是不可能的

7. Olfactory system ( cortex and neurons responsible for interpreting odours) can remember smell of almost 50000 different scents
7.嗅覺(jué)系統(tǒng)（負(fù)責(zé)解讀氣味的皮層和神經(jīng)元）能記住約50000種不同氣味。

8. Acid in our stomach can dissolve Razor blades
8.我們的胃酸能溶解剃須刀片。

9. Tooth is the only part of the body that can't repair itself.
9.牙齒是身體唯一不能自我修復(fù)的部分。

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（翻譯：菲菲）