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Nature 459, 335-336 (21 May 2009) | doi:10.1038/459335a; Published online 20 May 2009
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Earth science: Life battered but unbowed
Lynn J. Rothschild1
Abstract
Early in its history, Earth experienced a pounding from extraterrestrial impacts. But instead of sterilizing the planet, it allowed microbial life to persist, according to numerical models of Earth's crust.
The great baseball player Leroy 'Satchel' Paige, who pitched professionally until the alleged age of 60, asked "How old would you be if you didn't know how old you were?".
- Lynn J. Rothschild is at the NASA Ames Research Center, Moffett Field, California 94035-1000, USA.
Email: lynn.j.rothschild@nasa.gov
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