Seth Shostak quoteSeth Shostak [0-0]
American Scientist 
Quote rank: 706
| The Earth has been lawned with life for something over 3.5 billion years. That's a span of time great enough to encompass some honest-to-goodness catastrophe. For example, 700 million years ago, Earth underwent a planet-wide deep freeze, with ice covering the oceans from the poles to the equator. |
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