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

How to make handmade jewelry from copper wire by Lan Anh Handmade Can do the same with ring, pendants and bracelets to form ...

Election Day is Tuesday and Colorado voters will be able to cast their votes on two propositions dealing with school lunch funding. When is Election Day and how early can I vote? Election Day is ...