The National Geographic reports that for about as long as humans have created works of art, they've also left behind handprints. People began stenciling, painting, or chipping imprints of their hands onto rock walls at least 30,000 years ago.

With support from the National Geographic Society's Committee for Research and Exploration and Pennsylvania State University archaeologist Dean Snow, they analyzed the hand stencils at caves in Spain and France and found most of them were female. For a long time it had been widely believed that pre-historic artists were mainly men.

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