Repeats are key to understanding humanity's genome

It was like a map of New York missing all of Manhattan. The human reference genome finally has all its blank spots filled in, and seeing everything we missed the first time around is both repetitive—and enlightening.

What, or who, killed the last mammoths?

The last known population of woolly mammoths, roaming a remote Arctic island long after humans invented writing, were wiped out quickly, reports a study released Wednesday.

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