First broadcast: on BBC Four HDLatest broadcast: on BBC Four HD
Jim Al-Khalili uncovers the story of Sellafield. He encounters some of the most dangerous substances on earth, reveals the nature of radiation and even attempts to split the atom. Show more
First broadcast: on BBC FourLatest broadcast: on BBC Four
Michael Mosley investigates Porton Down, Britain's most secretive and controversial military research base. He comes face to face with chemical and biological weapons old and new. Show more
