"Science Bob and 30 other teachers launched 2,000 ping pong balls in zero gravity as part of Northrup Grumman Foundation's Weightless Flights of Discovery program. Also joining us was Kerry Sanders of the Today Show. Weightless flight is accomplished by flying in parabolas in reserved airspace aboard a modified 727 aircraft. Each weightless experience lasts about 30 seconds. Learn more about Science Bob at http://www.sciencebob.com"