What scientists do with their old balls I thought this was pretty interesting and a bit crazy. Heh, heh ... those silly scientists! http://www.space.com/scienceastronomy/mystery_monday_040301.html Actually I do find it rather interesting. I'd imagine that, for safety's sake, they don't want to drop them from any higher than 250 meters. That's pretty low, really, considering the ejecta from the impact reached so far.