"It is much better to learn the elements of geology, of botany, or ornithology and astronomy by word of mouth from a companion than dully from a book."

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Realizing how often ingenious speculation in the complex biological world has led nowhere and how often the real advances in biology as well as in chemistry, physics and astronomy have kept within the bounds of mechanistic interpretation, we geneticists should rejoice, even with our noses on the grindstone (which means both eyes on the objectives), that we have at command an additional means of testing whatever original ideas pop into our heads.

— Thomas Hunt Morgan