PRYING APART COLORS

“Why grass is green or why our blood is red are mysteries which none have reached unto,” wrote the English poet John Donne in 1612. He wasn’t quite right, because the fourth-century BCE Greek philosopher Aristotle had figured out that olors have something to do with light. But it wasn’t until about 53 years after Donne wrote his poem that anyone truly understood how light and color are connected. That was when the English scientist Isaac Newton discovered that sunlight contains