Why do some songs get stuck in your head?

Kangaroo mothercare, why we all look different, what's the capacity of the human brain and why do some songs get stuck in your head are all up for analysis this week, and Dr Chris also has news of how worms can treat inflammatory bowel diseases, a memory-erasing treatment for chronic pain, and bacteria that thrive on arsenic... Like this podcast? Please help us by supporting the Naked Scientists