what should I do with 20 1-inch diameter steel balls? Answered
my brother recently gave me 20 1 inch diameter steel balls that he was trying to use to cool down coffee without watering it down (in hindsight, aluminum has a much higher heat density, but that's beside the point). I've had them laying around for a while now, and apart from a big newton's cradle or maybe a huge marble machine, I can't think of anything to do with them. ideas?