quiet

atomic clock experiments:

http://hyperphysics.phy-astr.gsu.edu...iv/airtim.html

some shit on time dilation (the basic idea behind it):

http://members.tripod.com/wmhxbigguy/Theory/time.html

and the twin paradox:

http://math.ucr.edu/home/baez/physic...n_paradox.html