Archaeology: A New Key to the Family Tree

The bones unearthed at Teotihuacan are plenty ancient, but there's old and then there's old--and a find announced by South African scientists last week makes A.D. 150 seem like yesterday. Researchers at the University of the Witwatersrand reported that they've discovered the skeleton of a human ancestor that could be as much as 3.5 million years old.

That's even older than the celebrated Lucy, and comes from a time when humans still had many apelike characteristics. Best of all, this skeleton is almost complete; it even comes with a skull. There is no need to mix and match different specimens to...

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