'I inject myself with snake venom'
Meet Steve Ludwin. He is 51 and for the past 30 years he has been injecting himself with snake venom.
He told the Today programme it hurt - a lot - at the beginning, but now his body is almost immune and he is donating his blood to science.
He is a living specimen in a new exhibition at the Natural History Museum called Venom: Killer and Cure, external.
Videojournalist: Claudia Headon