As with other fields of human en-deavour, science has its myths. One of the best known goes like this. Once upon a time, the world was dominated by dinosaurs. Mammals were tiny, nocturnal and crept around minding their own business. Then one day a big, bad asteroid came along and wiped out all the dinosaurs. The mammals shouted "Yippee", leapt out of their burrows and took over. In the end, therefore, Homo sapiens rather than Tyran-nosaurus rex became top animal.
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