Extinction by asteroid a rarity: 'Sick Earth' extinctions more likely

In geology as in cancer research, the silver bullet theory always gets the headlines and nearly always turns out to be wrong.

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<p><a href="http://www.physorg.com/news142595837.html">Extinction by asteroid a rarity: 'Sick Earth' extinctions more likely</a></p> <p>In geology as in cancer research, the silver bullet theory always gets the headlines and nearly always turns out to be wrong.</p>