A nice experiment demonstrating that gravity changes the flow of time, just like the great man said it would.
ScienceDaily (Feb. 18, 2010)
http://www.sciencedaily.com/releases...0217131125.htm
Holger Müller says:
"If we used our best clocks, with 17-digit precision, in global positioning satellites, we could determine position to the millimeter," he said.
"But lifting a clock by 1 meter creates a change in the 16th digit".