Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. In today’s programme: a breakthrough in the fight against Alzheimer’s disease; warnings we might be on the brink of a measles outbreak in London; and why algae might help vegans with their vitamins.

Plus we look at what depression is, and how we can help to manage the condition. For support on topics covered in this programme, you can get details of organisations within the UK by visiting the BBC Actionline website. bbc.co.uk/actionline