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In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken', and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen.

在科学领域，科学家们经常会说，‘你知道这是一个很好的论点;我的立场是错误的’，然后他们就会改变主意，你就再也听不到他们的旧观点了。他们真的做到了。它不会发生。

— Carl Sagan 卡尔·萨根