We haven’t posted anything about Jörg Sprave in awhile, but in case you were wondering, he’s still making weapons. In this case, a mini-trebuchet that cools beer.
rubber stores energy thermally. If you stretch a rubber band, it gets warm. If you relax it again, it gets cold.
This video uses a specifically designed contraption that uses this effect to cool a can of beer with nothing more than muscle power and rubber. In fact this may be the first rubber based artificial cooling device ever. Wikipedia is by now in need of an update!
Hit the jump to check out the video.