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

Examining mistakes gives students a chance to discuss misconceptions openly and find new approaches to solving problems.

The numbers did not compute. Even before Terry Rozier dropped out of the 2023 NBA game in which he's accused of rigging his statistics, computers at an "integrity monitor" firm flagged a flood of bets ...

A Spurilla neapolitana, also known as the hair curler slug, has been found farther north than is typical of its species. The sea slug was spotted off the coast of Cornwall, England, in September.