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

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

Alan Hart pioneered X-rays for TB detection and was the first documented trans person in the U.S. to have a hysterectomy.

Check out the most popular cars of every decade, from the Ford Model T to the Tesla Model S.