April 17, 2009 9:50 am Zac Efron Is Back in School in “17 Again” After starring in three “High School Musical” films, Zac Efron is back to high school to play the teenage version of Matthew Perry in “17 Again.” US & World Videos 2:56 Kelly Clarkson jokes Jim Gaffigan is the Brock Purdy of dads 1:28 LAPD dismantles protester encampments at UCLA 1:36 Arizona Senate repeals 1864 abortion ban 1:40 Democrats say Big Oil misled public for decades about climate change 1:45 NYPD enters Columbia University in riot gear to clear protest