Corrections
Don’t forget RHIC
Several readers wrote in response to February's commentary by Jim Siegrist, director of the Office of High Energy Physics in the Department of Energy's Office of Science. Due to an editing error, the commentary stated that for the first time in decades, there is no particle collider operating on U.S. soil. The correct statement is that there is no particle collider for high-energy physics operating on U.S. soil. Readers rightly pointed out that the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory is operating well and colliding a range of particles from protons to gold nuclei, with funding from the Department of Energy's Office of Nuclear Physics. Symmetry regrets the error.
60 billionths of a second
In our February 2012 article on faster-than-light neutrinos, we reported that neutrinos from CERN appeared to arrive at Gran Sasso one 60-billionth of a second sooner than they should have. The actual time difference measured in this experiment was 60 nanoseconds, or 60 billionths of a second.
