His scientific work continued, however, and he even published a paper on gravitational redshift in Nature in February 2010[REF] and another one he co-authored in July 2010 [REF].
In March 2011 Chu said that regulators at the U.S. Nuclear Regulatory Commission should not delay approving construction licenses for planned U.S. nuclear power plants in the wake of the Fukushima Daiichi nuclear disaster in Japan [REF].