Thank you, Clay

According to an article in this month's issue of Science, large animals such as humans would not have been able to evolve if it weren't for clay first appearing in the Earth during the Neoproterozoic Era (roughly one billion to 542 million years ago). Details about this are available at http://dsc.discovery.com/news/briefs/20060206/clay_pla.html?source=rss

This is one more thing for me to think about when I see a work of pottery.

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