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

The tallest man to ever live was Robert Wadlow, who reached a staggering 2.72m. That's equal to a very large male ostrich or Shaquille O'Neal with two bowling pins balanced on his head.

Trump’s war on Big Law leads firms to retreat from ’pro bono’ work for underdogs Interviews with over 60 lawyers and 30 nonprofits show legal aid groups now have fewer resources to defend the ...