Tonight, the science show that looks into the future gives viewers the chance to suggest the idea for Megalab UK, the biggest experiment in science history. Plus a report on the extraordinary story of how fossilised rats' urine is helping to date natural water supplies in the desert state of New Mexico. With Carol Vorderman, Shahnaz Pakravan, Howard Stableford, Vivienne Parry and Monty Don.
See today's choices.
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