Beulah Louise Henry was an American inventor whose creations—including the double chain stitch sewing machine, vacuum ice cream freezer, hair curler, double-ended umbrella and improved can opener—helped revolutionize manufacturing technology.

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.