"We are seeing back to the matter-dominated universe, when expansion was decelerating and dark energy was hard to see. The transition from decelerating expansion to accelerating expansion was a sharp one, and now we live in a universe dominated by dark energy. The biggest puzzle in cosmology is, why now?"
MORE: http://www.sciencedaily.com/releases/2012/11/121112224343.htm
See also...
Particle change hailed as major find by CERN
http://www.newsdaily.com/stories/bre8ab1b0-us-cern/
