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In a pioneering new architectural project, the Digital Water Pavilion in Spain will have water walls instead of traditional brick walls which will part to allow people through, and at night the whole building will collapse into the ground. Carlo Ratti, running the project, explains how it works.

Also on the programme: How new breeds of cats have tiger and even dog in them, thanks to genetic makeovers, Plus, why Italians are simply not moving out of their parents' homes.