This humidity-powered seed drills itself into the ground

17 December, 2018
Powered by changes in humidity—curling when dry and straightening when wet—this Erodium cicutarium seed (or more specifically, an achene) will bury itself by slowly drilling into the ground. This time lapse video by p roullard shows its “hygroscopically active” spiraling shape. Also: Note the active soil. Erodium cicutarium, also known as redstem filaree, redstem s
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