Nobel laureate Sir Paul Nurse looks at what science can do to fix our bodies and extend our lives, and also whether it's right to use all the tools and techniques available. Show more

Professor Martin Rees, the astronomer royal, searches for extra-terrestrials in a film that gets inside the minds of the scientists considering whether we're alone in the universe. Show more

Dr Kevin Fong guides us through an ethical and scientific minefield as he considers whether sending men to Mars is worth the risk and if it is really achievable. Show more