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

Photos and letters show how James Watson and Francis Crick raced to uncover the double helix structure of DNA.

Want to avoid living room design mistakes? Interior designers share the common errors they often see, from furniture to decor ...

Every modern automobile carries a 17-character vehicle identification number, an alphanumeric string unique to that single car. Since 1981 federal rules have required that ...