To celebrate the 125th anniversary of the National Geographic Society, the October issue of National Geographic focused on discoveries through photography. This portrait shows footprints in volcanic ash at Engare Sero in Tanzania – believed to belong to a fast-moving party of adults and adolescents in the Pleistocene era, more than 10,000 years ago. The footprints provide evidence of modern humans moving through East Africa. (Photo by Robert Clark/National Geographic)
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