Seven years after the Chernobyl disaster, parts of Britain are still contaminated with fall-out. But in upland areas sheep with satellite trackers are being used to seek out the last hot spots. Can a new treatment reclaim this land? Plus the secret of seeing 3-D images without special glasses. Autostereograms - patterns of dots in which you can see vivid three-dimensional shapes - are the latest craze to hit America and Japan.
Producer Bill Grist ; Editor Dana Purvis