By the 1990s, synthetic voices for computers and the disabled were mostly male until researcher Ann Syrdal helped develop the first functional female synthetic voice, paving the way for AI assistants like Siri.

Check out some of the Damascus swords that have been built by bladesmiths in this compilation from Forged in Fire.

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.