As the ten-year ban on British beef is lifted, Tony Minson joins us to discuss what causes BSE, how it is spread and why it is such a problem, and with another example of how animal diseases pass to humans is Joanne Webster, who describes the life cycle of Toxoplasma gondii and its possible link to schizophrenia. Margaret Stanley provides some happier news and reveals the astounding success of a cervical cancer vaccine in clinical trials, and Derek Thorne has fun with food colouring in Kitchen Science.