Petroglyphs http://t.co/oYPQkiUX
July 21, 2012
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Despite their aura of mystery and antiquity, petroglyphs are relatively common. It has always amused me that scientists have spent so much time and effort trying to decipher them.
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Petroglyphs http://t.co/oYPQkiUX
Despite their aura of mystery and antiquity, petroglyphs are relatively common. It has always amused me that scientists have spent so much time and effort trying to decipher them.
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