About 700 U.S. military personnel in Afghanistan begin testing something called the Soldier Body Unit this month. It's a series of sensors designed to measure the impact of explosions, like bomb blasts, on a soldier's head and body. They'll detect what's happening within the body during a blast, and could possibly help detects symptoms of health issues. Later on, the data could be used for research outside the military. Plus, the Twitter Olympic Medal Ceremony.