Most people cannot go beyond their great-great-grandparents. How can we know about the lives of our ancestors who lived 30,000 - or 300,000 - or 3 million years ago?. To piece together the intriguing puzzle of human origins it is necessary to study all clues that are made available by multidisciplinary research, including paleontology, bio-chemistry, geology, genetics, physics, and climatology.
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