Einstein's Equation of Life and Death. E=MC 2 made Albert Einstein history's most celebrated scientist. It explains why the sun shines - but also underpins the nuclear bomb. Documentary and dramatised elements tell how his discovery went from symbols in a notebook to weapons of mass destruction.
Producers Aidan Laverty and Johanna Gibbon ; Editor
Matthew Barrett Repeat next Saturday www.bbc.co.uk/horizon In Einstein's Shadow concludes at 9pm on Radio 4