Movable type and the printing press
Mechanical clocks
Eyeglasses
Scissors
Windmills
Crop rotation
Universities. Okay, this one doesn't work anymore but it did for a long time until the 1960s.
Fire use was developed some time ago...it still “works”. The wheel still “works”. These LIBs are lunatics. I laugh at their eternal Loserdom.
Also: beheading.