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A 4.4-million year old fossil, discovered in Africa has opened a window onto humans' "early evolutionary steps," according to the group of scientists responsible for the find. Ray Suarez reports.
By PBS NewsHour
Fossils of tiny humans found on the Pacific island of Palau have fanned the flames of contention over whether another skeleton, discovered several years ago on the nearby island Flores, represents a new species of human.
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