When lost in the forest with no clues to where to go, humans tend to go in circles. And we have brains. Amoebas, which don't have brains, somehow manage not to end up going in circles when they have no clues where to go.

Ref: Science News, 3/31/07, p. 205, D.C., "How smart are amoebas?" Photo: "Amoeba Proteus, an animal consisting of a single naked cell. (PD)

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