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As colour returns to gardens across the country after the long cold winter, Quentin Cooper hears how records from two and a half centuries of nature-watching reveal the gradual advance of spring, and what this says about climate change.

Also in the programme, the UK team who have built a tsunami simulator to see how buildings can best resist the powerful seawaves created by earthquakes.

Nanoelectronics are brought a step closer with a new kind of digital logic.

And we hear from more potential participants in Radio 4's "So You Want to be a Scientist" talent search.