Take an outline map of the lower 48 U.S. states and four crayons. Can you shade in the map so that every state is a different color than each of its neighbors, without resorting to a fifth color? This ...

*Refers to the latest 2 years of stltoday.com stories. Cancel anytime. From HAL 9000 to IBM's Watson, how much do you remember about famous computers over the last 70 years? Take our quiz and find out ...

It could be a case of game over for draughts - scientists say the ancient board game has finally been solved. A Canadian team has created a computer program that can win or draw any game, no matter ...