To me it appears that there are teeth on one "side" of the gear, but on the back... | Hacker News

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		ocharles on Sept 12, 2013 \| parent \| context \| favorite \| on: First Mechanical Gear Found in a Living Creature To me it appears that there are teeth on one "side" of the gear, but on the back of it is a flat surface. The valley between the teeth is sloped from front to back, going from a deep valley to no valley at all. At least, that was what I took from that picture.

Kliment on Sept 13, 2013 [–]

Just like herringbone gers you find in old sewing machines, designed to self-align in one direction.

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