May 31, 2011 6:28 am A Giant Step Forward Bionic legs offer mobility to spinal injury patients. US & World Videos 0:40 Watch: Police dog tracks and finds missing 85-year-old woman in Colorado 2:19 11-year-old celebrates teachers with appreciation snack cart 1:19 Met Gala 2024 after party looks: Cardi B, Lana Del Rey, EmRata 6:22 Craig Melvin compares ‘TODAY' crew to NASCAR 1:02 Judge indefinitely delays Trump's classified documents criminal trial