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

The Buffalo Bills played a masterful, physical brand of football chess against the suddenly hot Kansas City Chiefs, winning ...

Astronomers are rethinking one of cosmology’s biggest mysteries: dark energy. New findings show that evolving dark energy models, tied to ultra-light axion particles, may better fit the universe’s ...

Learn how Hubble is measuring the expansion rate of the Universe in this new explainer from NASA's Goddard Space Flight ...

For the first time, an international research team led by the Shanghai Astronomical Observatory (SHAO) of the Chinese Academy ...

Water types include spring water, mineral water, distilled water, sparkling water, and purified water, among others. Some types may have more nutrients than others. Drinking enough water daily is ...

See how the Arctic’s most enigmatic animals are coping as the sea ice melts. Mes de Herencia Hispana con Cumbre Kids Únete a PBS Nature y Cumbre Kids durante el Mes de la Herencia Hispana.