Breakthrough tech helps paraplegic patients walk again

It's a world first: two research teams in the US have helped patients with complete paralysis walk again thanks to groundbreaking spinal stimulation therapy. In this edition, we speak to the author of the study, Susan Harkema. Plus, we tell you what scientists plan to do to stop glaciers from melting. And in Test 24, we take you on an incredible immersion experience in space with the VR chair Optione.