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 ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American When you launch a human body into space, ...

This is a coelacanth: the enormous living relative of the first fish that crawled onto land about 410 million years ago. Now another link to its land-loving ancestors has been confirmed: the ...