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.

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.