A 4.4 billion-year-old zircon crystal from the Jack Hills region of Australia is pictured in this undated handout photo obtained by Reuters February 23, 2014. REUTERS/John W. Valley/University of ... more 
A 4.4 billion-year-old zircon crystal from the Jack Hills region of Australia is pictured in this undated handout photo obtained by Reuters February 23, 2014. REUTERS/John W. Valley/University of Wisconsin-Madison/Handout via Reuters less 
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Reuters | Photo By HANDOUT / Reuters
Sun, Feb 23, 2014 6:00 PM EST