Breakthrough of the Year

ardiThe staff of the journal Science has named the 4.4 million-year-old fossil known as “Ardi”—a million years older than the famous fossil “Lucy”—the top breakthrough of 2009 for changing the way we think about our family tree and how we evolved.
As contributing correspondent Ann Gibbons explains:

In the year of the bicentennial of Darwin’s birth, it seems fitting that researchers finally broke through the 4-million-year barrier to understanding our origins. Models for our earliest ancestors can now be informed by plenty of fresh data and at least one body of hard evidence.

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