I love petroglyphs. They are one of my favorite arforms. I saw this story on the BBC News website and wanted to share..
Colourful ancient art is alive;
A particular type of ancient rock art in Western Australia maintains its vivid colours because it is alive, researchers find.
http://www.bbc.co.uk/go/em/fr/-/news/science-environment-12039203
(spoiler- it's fungi in the pigments, not the actual rocks that are alive.)
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