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

On a foggy Saturday morning in 1953, a tall, skinny 24-year-old man fiddled with shapes he had cut out of cardboard. They ...

Tucked away in the rolling hills of southeastern Indiana lies a village so charming, so perfectly preserved, that stepping into it feels like walking through a portal to America’s past. Metamora isn’t ...

We've all used channel locks and pipe wrenches, but many of us are making simple mistakes! This video covers important tips and common errors when using these plumbing tools, including the following p ...