It may have existed on Mars, but it turns out there's no single satisfactory definition for life.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/yeX-Y_x_-gQ" height="1" width="1"/>
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It may have existed on Mars, but it turns out there's no single satisfactory definition for life.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/yeX-Y_x_-gQ" height="1" width="1"/>