As 'Tomorrow's World' goes off the air for a summer break, the series concludes with a timely look back at some items from the past year. Michael Rodd simplifies solar physics and studies otters in a California zoo, while Kieran Prendiville road-tests a new timber tractor. Judith Hann demonstrates a phone-operated heart monitor and scales new heights with a DIY lift, and Prendiville returns to bash out a tune on a new synthesiser that can sample real sounds.