Catch up on BBC Four
It's Only a Theory
Andy Hamilton, Reginald D Hunter and Dermot Murnaghan see if experts' theories are valid.
Mars
How the possibility of life on Mars has fuelled man's quest to visit the Red Planet.
Mark Lawson Talks To Jane Horrocks
The actress talks to Mark Lawson about her life and career. 9pm
Life, Tue 8pm
Mammals' ability to learn new tricks is the key to survival in the world of hunters and hunted.
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