Professor's liquid nitrogen 'cannon' launches 1,650 ping pong balls
Friday, August 7, 2015 - 12:00
in Earth & Climate
Ben HooperPLYMOUTH, England, Aug. 7 (UPI) -- A professor at a British university dropped a bottle of liquid nitrogen into warm water to create a "cannon" launching 1,650 ping pong balls into the air.