[pepsi_junkie]

Other things which are medieval solutions that still work:

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.

[hal ogen]

Fire use was developed some time ago...it still “works”. The wheel still “works”. These LIBs are lunatics. I laugh at their eternal Loserdom.

[bigbob]

Also: beheading.