How the first fish learned to walk on land: Scientists use a robot to unlock an evolutionary mystery

New research sheds light on one of evolution's most important transitions—and a robot helped reveal the answer.
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When did the first fish live on Earth – and how do scientists figure out the timing?

Add Yahoo as a preferred source to see more of our stories on Google. To figure out how long ago fish first appeared on Earth you need a way to measure really, really long time intervals. Clocks ...