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

I had just graduated from the University of Miami – sun still on my skin, confidence in my step – and Chicago was calling louder than any beach could. I wasn’t chasing an office job with a cubicle and ...

Human remains discovered earlier this year in a remote area of northwestern Washington state are those of an Indigenous woman ...

A woman who claimed she is Madeleine McCann has been charged with harassing the missing toddler’s parents. Julia Wandelt has ...