Did you ever wonder why, while there are lots of round and cylindrical living things, there are almost no square plants or animals? Why isn't there any animal that has a skeleton made out of metal? And while there are so many ways for living things to move about, why do almost none of them have wheels?

Ref: Wickelgren, Ingrid. 1989. "The mechanics of natural success." Science News, v. 135, June 17. p. 376. Image:  A composite of the skeletons of a Human and a Horse arranged into a lifelike pose, at an exhibit in the Australian Museum, Sydney, Australia. (PD)

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