Comment by davidcuddeback

Before 9/11, my little sister built a cloud chamber for the science fair. This required using a small vile of Uranium, which my dad was able to obtain for her from a nearby university. This didn't require any extraordinary connections or security clearance. I think he just phoned up a professor and drove to the university to meet him. This was probably 2000 or 2001. I suspect this wouldn't be possible now, after 9/11, but I haven't tried.