Quantum physics underlies technologies from the laser to the smartphone. The International Year of Quantum marks a century of scientific developments.

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, ...

China’s export ban has created a perfect storm. With soaring demand and vanishing supply, antimony is now a critical ...