She found an envelope in the jar with the message: "I hope this money will help you and your family in these rough times."
VOA: special.2010.02.05
The most altruistic behavior of all, giving your life to help another, can be explained in cold-blooded evolutionary terms.
最利他的行为,就是为他人牺牲自己,这也可以用毫无人情味的进化论来解释。
and how using your knowledge of math can help you solve something in biology.
如何用数学方面的知识解决生物方面的问题。
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