From: Sam Wormley on
OBSERVATIONS: Einstein's gravitational redshift measured with
unprecedented precision

A new paper co-authored by U.S. Energy Secretary Steven Chu measures the
gravitational redshift, illustrated by the gravity-induced slowing of a
clock--a measurement that jibes with Einstein and that is 10,000 times
more precise than its predecessor
http://cl.exct.net/?qs=926acdd1e8d6491e0c7c1c978f473f7e32a12e94dc0da8ed22a9822cc30efd5c