Olival Freire Jr is a professor of physics and the history of physics at the Federal University of Bahia, Brazil. What makes matter stable? Why are atoms as they are? Why do different materials vary ...

It’s mass for the masses. A tabletop device makes the new definition of the kilogram more accessible. Previously, the kilogram had been equal to the mass of a special metal cylinder kept in a vault ...

Researchers have developed a chip-based quantum random number generator that provides high-speed, high-quality operation on a ...

A hidden world of quantum metrologists ensure that everyday devices perform safely and correctly, but their work is never ...