"When discussing organic evolution the only point of agreement seems to be: ‘It happened.’ Thereafter, there is little consensus, which at first sight must seem rather odd."

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Paleontologist Niles Eldredge, a prominent evolutionist, said: 'The doubt that has infiltrated the previous, smugly confident certitude of evolutionary biology’s last twenty years has inflamed passions.' He spoke of the 'lack of total agreement even within the warring camps,' and added, 'things really are in an uproar these days . . . Sometimes it seems as though there are as many variations on each [evolutionary] theme as there are individual biologists.'

— Niles Eldredge