Quora精選：日常生活中的科學冷知識
What are the most fascinating science facts?
有什麼最吸引人的科學事實？
獲得12.3k好評的回答@Alyanna Rosales：
The existence of gravity.
重力的存在。
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.火苗向上是因爲受重力影響冷空氣下沉，熱空氣上升。但如果沒有重力，火苗就是這樣：
out gravity bacteria gets tougher. A research shows that salmonella can get 3 times stronger in microgravity. Good thing we have gravity!
2.沒有重力的話細菌會更難對付。一項研究顯示失重狀態下沙門氏菌會強大3倍，真慶幸我們有重力！
lastly, Newton wasn't hit by an apple. He only saw an apple fall to the ground.
3.最後，牛頓並沒有被蘋果砸中，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 muscles
1.一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 day
2.身體裏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 productivity
3.天氣好時一天在戶外20分鐘能愉悅心情、拓寬思路並提高工作效率
4. Happiness is maximized at 13.9 degrees Celsius
4.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 court
5.人一個肺部的表面積相當於一個網球場
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 scents
7.嗅覺系統（負責解讀氣味的皮層和神經元）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鬚刀片。
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的部分。
（翻譯：菲菲）
