Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow: red, ...

Green Day's long-awaited South African debut on Jan. 19 was anything but ordinary. By Jessica Lynch Green Day delivered a politically charged performance during their Jan. 19 concert at ...

However, there are many color variations of obsidian, with red and green being common. (1−3) Historically, several well-known obsidian deposits were extensively utilized by the Aztec Empire and the ...

Beckert’s argument is hard to ignore. Yes, as we are told daily, many politicians, investors and business executives want emissions cut, green energy boosted and the climate made safe for their ...