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, ...

Where would carbon-based life be without carbon? There are 118 known chemical elements, but carbon is the fourth most ...

Neo recycles a few dozen tons of high-purity gallium a year, mostly from semiconductor chip manufacturing scrap, at a factory ...