All human knowledge is from experience.
There are only two tragedies in life: one is not getting what one wants and the other is getting it.
生活里有两个悲剧：一个是没有得到我们想要的；另外一个是得到了。
The beauty of science lies in its ability to explain the natural world through observation and experimentation.
巨人倒下时，身体还是暖的。