Kieran Prendiville introduces Hissing Sid, a versatile robot that suffers an unfortunate attack of 'live TV nerves'. Judith Hann reveals a surprising link between baked Alaska and a light-weight metal tennis racquet. Michael Rodd tests a new technique to update microfiche and travels to South Africa to investigate 'jumbo hail stones', while Su Ingle brings encouraging news for diabetics. (1981) Show less