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

With close to a decade of writing and editing experience, Maisha specializes in service journalism and has produced work in the lifestyle, financial services, real estate, and culture spaces. She uses ...

Editor's Note: APYs listed in this article are up-to-date as of the time of publication. They may fluctuate (up or down) as the Fed rate changes. CNBC Select will update as changes are made public.

Professor Raúl Rojas has published a book about how symbols have been used throughout history in mathematics. The work was translated into English this year.

The Secret Order Season 1 Episode 4, where Guy’s hunt for the mysterious “752” tests his loyalty to Jasper and the Talamasca.