The past is a kind of future that has already happened.
安全总是过度的,直到它不够为止。
CRISPR是一种工具,和任何工具一样,它的影响取决于我们如何使用它。
A good world needs knowledge, kindliness, and courage; it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.