Quora精選：日常生活中的科學(xué)冷知識

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

 

獲得12.3k好評的回答@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绊懤淇諝庀鲁粒瑹峥諝馍仙?。但如果沒有重力，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.沒有重力的話細(xì)菌會更難對付。一項(xiàng)研究顯示失重狀態(tài)下沙門氏菌會強(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，牛頓并沒有被蘋果砸中，他只是看見一個蘋果掉在地上。

 

獲得4.5k好評的回答@Amandeep Litt：

1. One eye blink needs movement of about 200 muscles1.一個眼睛眨動需要牽動約200個肌肉2. Every drop of blood in your body is filtered over 300 times in a day2.身體里每滴血每天都要被過濾超過300次3. 20 minutes a day outside in a good weather boosts good mood, broadens thinking and improves productivity3.天氣好時一天在戶外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 Celsius4.快樂會在13.9攝氏度時最大化5. Surface area of a human lung is equal to a tennis court5.人一個肺部的表面積相當(dāng)于一個網(wǎng)球場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 scents7.嗅覺系統(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 blades8.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。

 

（翻譯：菲菲）

(來源:滬江)