让我们来讨论一个问题:我们能否认识宇宙或银河系星群或一颗恒星或一个世界呢?我们能否最终详尽地认识一颗盐粒呢?试考虑一微克食盐吧,取其量多到恰好用肉眼而不借助显微镜就能看清。在这粒盐中,大约有10~(18)个钠和氯原子。如果我们希望认识一粒盐,我们至少得知道这些原子的每一个的三维位置(事实上,还有更多的东西需要知道,例如,原子间力的本质,但我们暂作一粗略的计算)。那么,这个数目比脑所能知道的事件数目,是多了呢还是少了呢? Let’s talk about a question: can we know the universe or the galactic constellation or a star or a world? Can we finally come to a detailed understanding of a grain of salt? Consider one microgram of salt, Just with the naked eye without using a microscope can see. In this salt, there are about 10 to 18 sodium and chlorine atoms. If we want to know a grain of salt, we at least know the three-dimensional position of each of these atoms (in fact, there is more to know, for example, the nature of atomic forces, but for the moment we make a rough calculation) . So, this number is greater than the number of events the brain can know, or less?