nasa says it s all set for a summertime test of what it calls its low-density supersonic decelerator. that is what nasa says it will look like when traveling through space. it is technology that could be crucial for mar s exploration because it could help to slow down a landing module traveling at high speed. they tested it at the jet propulsion laboratory yesterday. wow. it is hailed as bridging a divide between state of the art and high-tech. artificial prosthetics typically cost thousands of dollars and everyone who needs them can t always afford them but 3-d printers are increasingly changing all of that. reporter: missing a left arm doesn t stop 7-year-old faith lenox from surfing, playing baseball or bike riding now she has a custom robo-hand the sky