Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Your emotions can be an important guide to help you think better, except when they don't. A new study suggests how to ...

A new theory claims dark matter and dark energy don’t exist — they’re just side effects of the universe’s changing forces. By ...

President Trump has set his sights on defunding colleges, singling out some of the world’s wealthiest schools in what critics say is an attack on academic freedom. Some are negotiating. Others are ...

With more than a decade of experience, Nelson covers Apple and Google and writes about iPhone and Android features, privacy and security settings, and more. Regardless of the features that made major ...