An awn of the seed of Pelargonium carnosum unwinds in response to humidity changes, and the seed digs into the ground. (IMAGE)

American Institute of Physics

An awn of the seed of Pelargonium carnosum unwinds in response to humidity changes, and the seed digs into the ground.

Caption

An awn of the seed of Pelargonium carnosum unwinds in response to humidity changes, and the seed digs into the ground.

Credit

Jung et al.

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