Description
关于万有引力的发现，有这么一个传说：有一天，牛顿正坐在苹果树下休息，忽然一个熟苹果掉下来，砸到他的头上，牛顿由此提出了万有引力定律。那么，为什么果实成熟后会掉下来呢？其实，牛顿已经帮我们解开了一半的答案。果实成熟后，如果不及时采摘，大都会自行脱落，这并不是因为果柄太细，不堪果实的重负，而是因为果实必须落到地上，才能发芽生根，长出新的果树来。为了繁殖后代，当果实成熟时，果柄上的细胞就开始衰老，在果柄与树枝相连的地方形成一层所谓“离层”。离层如一道屏障，隔断果树对果实的营养供应。最后，由于地心的吸引力，果实纷纷落地。
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