Desert Varnish

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Added by drmavis
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We have a renewed interest in desert varnish, which have been puzzling scientists for hundreds of years. Why should we be so excited about those boring red/black coats on rocks?!?
Guest: James Irwin
Date taken: March 2016
Release date: August 2016
Category
Educational
Tags
desert, varnish, petroglyph, Mars, bacteria, mystery, Arizona, Idaho

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