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David Baddiel tries to understand how wifi works.

Wifi is everywhere around us. It facilitates large parts of the modern economy, but how does it work? In this first episode of a new series of David Baddiel Tries to Understand, David tries to find out. At a wifi installation in London, he hears some basics, and begins to grasp what can stop wifi working. But will his second expert, a professor of wireless communication, be able to get through to David?

Producer: Giles Edwards