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Old 02-19-2006, 08:20 PM  
je_rome
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Join Date: Jul 2005
Posts: 6,846
Early Earth would have been very different and inhospitable compared to the Earth today and it was believed that the early earth's harsh conditions are conducive for breeding viruses.

http://nai.arc.nasa.gov/institute/fo...etail.cfm?ID=8
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