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Uncovering the secrets of ancient rock art using 'X-ray vision'

Prehistoric rock paintings are a source of fascination. Aside from their beauty, there's deep meaning in these strokes, which depict ancient rituals and important symbols. Scientists now describe use of 'X-ray vision' to gain brand-new insights about the layers of paint in rock art in Texas without needless damage.

from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/04/190401075146.htm
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