Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs.

In today’s programme: a leading authority on serial killers examines Lucy Letby’s motives and how we prevent a repeat. And DJ Chris Evans reveals he has melanoma, but what exactly is it?

Plus: India becomes only the fourth country in history to land a spacecraft on the Moon. We find out how much we really know about the brightest object in our night sky.