Cave wall paintings from La Pasiega in northern Spain. The ladder shape, composed of red horizontal and vertical lines, dates to older than 64,000 years and must have been made by Neanderthals. (P. Saura, Breuil et al.)

Cave wall paintings from La Pasiega in northern Spain. The ladder shape, composed of red horizontal and vertical lines, dates to older than 64,000 years and must have been made by Neanderthals. (P. Saura, Breuil et al.)

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