No need to thank dinosaur-killing asteroid for mammalian success

It is a natural history tale that every third grader knows: The dinosaurs ruled the Earth for hundreds of millions of years, until an asteroid struck the Yucatan Peninsula and triggered a mass extinction that allowed the ancestors of today’s mammals to thrive.

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<p><a href="http://www.physorg.com/news94308957.html">No need to thank dinosaur-killing asteroid for mammalian success</a></p> <p>It is a natural history tale that every third grader knows: The dinosaurs ruled the Earth for hundreds of millions of years, until an asteroid struck the Yucatan Peninsula and triggered a mass extinction that allowed the ancestors of today’s mammals to thrive.</p>