The planarian is nobody's idea of a genius. A flatworm shaped like a comma, it can be found wriggling through the muck of lakes and ponds worldwide. Its pin-size head has a microscopic structure that ...
Jack Challoner, Gills of a fish-like invertebrate (all images courtesy Jack Challoner, from ‘The Cell: A Visual Tour of the Building Block of Life‘) In 1665, when British polymathic scientist Robert ...
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