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

Also, how do Jordan Spence's defensive rankings compare to his teammates? And a look at improvements on the penalty kill.

Lehigh researchers create new method that improves consistency between predicted and observed data. An international team of mathematicians led by Lehigh University statistician Taeho Kim has ...

Physics can feel inscrutable to students; this lesson helps them understand a graphing problem by analyzing their own ...