"While airplane and rocket experiments have proved that gravity makes clocks tick more slowly — a central prediction of Albert Einstein's general theory of relativity — a new experiment in an atom interferometer measures this slowdown 10,000 times more accurately than before, and finds it to be exactly what Einstein predicted. The result shows once again how well Einstein's theory describes the real world"
http://www.scientificcomputing.com/news-DS-Precisely-Testing-Einsteins-Gravitational-Redshift-Phenomenon-021810.aspx (http://www.scientificcomputing.com/news-DS-Precisely-Testing-Einsteins-Gravitational-Redshift-Phenomenon-021810.aspx)