Q.E.D. (quod erat demonstrandum, Latin for "that which was to be demonstrated") was the name of a strand of BBC popular science documentary films which aired in the United Kingdom from 1982 to 1999.
Follows the story of inventor Trevor Baylis and his clockwork radio which is set to be mass produced in South Africa.
In 1991, Trevor Baylis saw a television programme about the spread of AIDS in Africa and he set about developing the Wind Up Radio. His first working prototype ran for 14 minutes and in 1994 was featured on the highly rated Tomorrows World TV programme. The products potential was immediately recognised and the following year BayGen Power Industries was set-up in Cape Town, South Africa employing disabled workers to manufacture the Freeplay Wind Up Radio. The BBC programme QED filmed an award winning documentary about Trevors development of the radio.