Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...
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Researchers Studied a 11,000-Year-Old Rock Art Motif—and Uncovered a Fascinating Story
Deep in the Colombian Amazon region of Serrania De La Lindosa, a roughly 12-mile stretch of rock is covered in a vast tapestry of ochre-colored art. Some of the drawings stretch back more than 11,000 ...