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

A new collection of research papers examines how humans conceptualize numbers and the numeral systems we’ve build around them ...

Most of us have little trouble working out how many millilitres are in 2.4 litres of water (it’s 2,400). But the same can’t ...

The Pleiades star cluster is 20 times larger than it looks at first sight, astronomers have learned. The cluster celebrated ...

New research from the University of Waterloo is making inroads on one of the biggest problems in theoretical computer science ...