"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." So, you’re in a talking stage with someone you really, really like. You’ve been texting every day, ...

Explaining consciousness is one of the greatest challenges in science and philosophy, right up with the origin of the universe, the existence of dark matter, and whether there is intelligent life on ...

String theory is one of the most ambitious ideas in modern physics, aiming to unite all forces of nature into one framework.

Health Secretary Robert F. Kennedy Jr. has upended medical research and public health in the U.S. in many ways. One of the ideas that could be influencing his overhaul of federal health agencies dates ...