Researchers have cracked a fundamental optical challenge: how to control both angle and wavelength of light independently—a ...

Welcome to one of humanity’s most hotly contested questions—no, not “What is the meaning of life?” or “Does pineapple belong on pizza?” Rather, it’s the eternal domestic toilet paper showdown ...

An attosecond—or 0.000000000000000001 second—is no time at all for a person. That is not so for electrons, atoms and molecules, and laser-wielding scientists are revealing the action ...

Both UVA and UVB rays can damage your skin, just in different ways. One causes premature aging, the other is more prone to causing sunburn, DNA damage, and skin cancer.