After retiring as general of the Continental Army in 1783, the future president wrote a letter called “Circular to the States” in which he shared his vision of how America and its citizens could succeed or fail in the years to come.

Kevin Knight describes how a team developed a high-tech codebreaking AI called Carmel to crack the Zodiac cipher.

Learn how true darkness surrounded the cast and crew of the first-ever vampire film, "Nosferatu".

From Ancient Egypt to America in the Civil War, the use of booby traps has been a long-held tactic to subdue an enemy.