Flame colors span a spectrum that tells a tale as old as fire itself. Many people wonder what color is the hottest flame; more than a testament to the natural fascination with fire's beauty, this ...

NEW YORK — Most people likely think they know what color is, but they should try explaining the concept to an 11-year-old. Even scientists have a hard time. Last year, as part of his annual Flame ...

Actor Alan Alda has a question: "What is color?" And as part of his annual Flame Challenge, he wants scientists to answer it in a way that an 11-year-old can understand. Alda is famous for starring in ...

About six months ago, my 8-year-old asked whether fire was a solid, a liquid, or a gas. I am sad to confess that my answer at the time was: “A gas. … No, a solid ...