Elon Musk says his company Space X will focus on establishing a ‘self-growing city’ on the moon before going to Mars. Why the pivot? And what would it take to build a lunar metropolis? Victoria Gill speaks to head of space at the Science Museum Libby Jackson.

Can we stimulate the human brain to make humans more altruistic? Professor of neuroeconomics at the University of Zurich, Christian Ruff brings us the results of his experiments. And science journalist Caroline Steel brings us her selection of the most exciting new scientific discoveries this week.

To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.

Presenter: Victoria Gill