dr. massry is afraid he like others could be killed any time. he carries his i.d.erywhere. >> you're preparing for death as well? >> yes, we are preparing ourself for death. >> men dazed with amputated limbs, a child with head trauma battling to get up. many medics tell me only faith can keep them on their feet. >> we got to give the power to work. we work sometimes 20 hours continuous. >> but even the call of god drowned out by the agony. carl penhaul, cnn, gaza. >> that was a couple weeks ago, but it's a perspective. a medical perspective that i hope doesn't get lost in all of this, we do know the hospitals that you just saw is still up and running. thanks to carl penhaul. up next, we're shifting gears. many people thought this was never going to happen in their lifetimes, a federal law introduced in congress to legalize some types of marijuana. you've seen the labels, gluten free, but what does that really mean? first things first, gluten is a protein found in wheat and other grains. and pasta and bread. for the 3 million americans with celiac disease it can be