'(<a href="http://www.j-archive.com/media/2009-07-13_DJ_17.wmv">Sarah of the Clue Crew levitates a ping-pong ball over a hair dryer.</a>)  What goes up stays up when the force of air moving up from the hair dryer equals this force pulling down on the ping-pong ball'
gravity
SCIENCE: What goes up stays up when the force of air moving up from the hair dryer equals this force pulling down on the ping-pong ball
What goes up stays up when the force of air moving up from the hair dryer equals this force pulling down on the ping-pong ball
What goes up stays up when the force of air moving up from the hair dryer equals this force pulling down on the ping-pong ball
SCIENCE
gravity
SCIENCE