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Science 21 December 2007:
Vol. 318. no. 5858, p. 1854
DOI: 10.1126/science.318.5858.1854
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News of the Week

EVOLUTION:
Did an Asteroid Shower Kick-Start the Great Diversification?

Richard A. Kerr

This week, a team of geologists and paleontologists reports that a collision in the asteroid belt showered Earth with debris just when the Ordovician diversification was getting started, suggesting a cause-and-effect connection.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)