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What are the most fascinating science facts? 有什么最吸引人的科学事实？ 获得12.3k好评的回答@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.火苗向上是因为受重力影响冷空气下沉，热空气上升。但如果没有重力，火苗就是这样： 2.Without gravity bacteria gets tougher. A research shows that salmonella can get 3 times stronger in microgravity. Good thing we have gravity! 2.没有重力的话细菌会更难对付。一项研究显示失重状态下沙门氏菌会强大3倍，真庆幸我们有重力！ 3.And lastly, Newton wasn't hit by an apple. He only saw an apple fall to the ground. 3.最后，牛顿并没有被苹果砸中，他只是看见一个苹果掉在地上。 获得4.5k好评的回答@Amandeep Litt： 1. One eye blink needs movement of about 200 muscles 1.一个眼睛眨动需要牵动约200个肌肉 2. Every drop of blood in your body is filtered over 300 times in a day 2.身体里每滴血每天都要被过滤超过300次 3. 20 minutes a day outside in a good weather boosts good mood, broadens thinking and improves productivity | 
