Nearly a century after Albert Einstein and Niels Bohr turned a technical disagreement into a philosophical duel, a new generation of experiments has given Bohr the edge in their most famous clash. By ...

Scientists have long grappled with a fundamental question: what exactly is light? Is it a wave, flowing like ripples across water, or is it made up of tiny particles, like miniature paintballs zipping ...

In a striking display of quantum physics, a team of researchers has recreated one of science’s most legendary experiments—with unprecedented precision. At MIT, scientists cooled thousands of atoms to ...