Archaeologists just pried another secret of our past from the clutches of the earth, welcoming a new human species to our growing family tree.
This discovery began with an ancient foot, or what was left of one. A foot bone, called the third metatarsal, was found in the Callao Cave on the Philippine island of Luzon back in 2007.
The oldest known Homo sapiens remains, found nearby on Palawan Island, were dated to 30,000 to 40,000 years ago. But this mysterious foot is older, dated to 67,000 years ago.
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