For Science Week the Tomorrow's World team give viewers and a studio audience the chance to be scientific guinea pigs. Plus pop stars worldwide record a single on the internet, Beachy Head's Belle Tout lighthouse moves back 17 metres from the cliff edge, and an investigation into shedding unwanted pounds effortlessly. Presented by Peter Snow and Philippa Forrester, with Jez Nelson, Craig Doyle,
Anya Sitaram and Lindsey Fallow. See today's choices.
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