The human hand: not really that good for anything

Long ago primitive sharks had ridges running down their sides from gill to tail. Later, muscles grew into the folds, and eventually, the central portion of each ridge receded while the ends enlarged to form fins both fore and aft. All was well. Then one day several hundred million years ago, a fish was swimming blissfully in a shallow pool. The tide went out and much to the fish’s surprise, she could use her five-rayed fins to move around a bit on the rocky bottom. The tide came in and she swam away, never to give this event another thought. The world, however, was forever changed. For many generations thereafter, that fish’s offspring went back to the pool and progressively got bet...

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