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University of Wisconsin-Madison Geoscientist Clark Johnson holds what he says is a 3.5 billion year old rock in Madison, Wis. Johnson is leading a team of scientists and others studying Earth rocks that are billions of years old looking for crucial information to understand how life might have arisen elsewhere in the universe and guide the search for life on Mars one day.

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Wisconsin scientists help search for alien life

MADISON, Wis. — Scientists at the University of Wisconsin-Madison are helping search for evidence of alien life not by looking into outer space, but by studying some rocks right here on Earth.

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