In science, we must be open to the possibility that our most cherished theories could be wrong.
译文:答应别人的话,千两黄金都不能更改。
如果我们挑选出人类中最聪明、最有想象力、最精力充沛且情绪最稳定的三分之一,所有种族都会在其中有所体现。
The land doesn’t belong to us—we borrow it from future generations.