Physicists, rejoice! (Even more!) Science magazine is reporting that Obama has chosen to nominate physicist John Holdren as his science adviser. The well-credentialed and -bearded Holdren is currently a professor of environmental policy at Harvard's Kennedy School, as well as the director of the Science, Technology and Public Policy Program at the Belfer Center for Science and International Affairs. A top adviser to Obama's campaign and world renowned expert on climate change, energy policy, and nuclear proliferation, Holdren is the second physicist to join the president-elect's team, following Nobel Laureate Stephen Chu's appointment as Secretary of Energy. Related: Cosmic Variance: Steven Chu Nominated to be Secretary of EnergyImage: AAAS