Rule of 7 in research. You can find out anything if you are willing to go seven levels. If the first source you ask doesn’t know， ask them who you should ask next， and so on down the line. If you are willing to go to the 7th source， you’ll almost always get your answer.

真正的文学不仅娱乐，还质疑和改变。

The idea that a bell rings to signal when investors should get into or out of the market is simply not credible.

青蒿素的发现是传统中医药给人类的礼物。