Only a few centuries ago, a mere second of cosmic time, we knew nothing of where or when we were. Oblivious to the rest of the cosmos, we inhabited a kind of prison -- a tiny universe bounded by a nutshell. How did we escape from the prison? It was the work of generations of searchers who took five simple rules to heart:

Question authority - No idea is true just because someone says so, including me. Think for yourself.
Question yourself - Don't believe anything just because you want to. Believing something doesn't make it so.
Test ideas by the evidence gained from observation and experiment - If a favorite idea fails a well-designed test, it's wrong! Get over it.
Follow the evidence, wherever it leads - If you have no evidence, reserve judgment. And perhaps the most important rule of all...
Remember, you could be wrong - Even the best scientists have been wrong about some things. Newton, Einstein, and every other great scientist in history, they all made mistakes. Of course they did -- they were human. Science is a way to keep from fooling ourselves... and each other.

刷toefl刷不下去时聊以慰藉

太阳，从其它行星的灰烬中产生。
It will rise from the ashes of other stars.

We are made of star stuff.
我们都是由星辰物质组成