Saul Perlmutter, who led one of two teams that simultaneously discovered the accelerating expansion of the universe, has been awarded the 2011 Nobel Prize in Physics, to be shared with two other scientists, including former UC Berkeley postdoc Adam Riess. The discovery in 1998 led to the realization that the universe is largely composed of an enigmatic "dark energy." Video produced by Roxanne Makasdjian, UC Berkeley Media Relations http://newscenter.berkeley.edu/2011/10/04/saul-perlmutter-awarded-2011-nobel-prize-in-physics/ http://www.berkeley.edu http://www.facebook.com/UCBerkeley http://twitter.com/UCBerkeley

eCHEM 1A: Online General Chemistry College of Chemistry, University of California, Berkeley http://chemistry.berkeley.edu/echem1a Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines Chemical Demonstrations by Lonnie Martin Video Production by Jon Schainker and Scott Vento Developed with the support of The Camille & Henry Dreyfus Foundation