Kate Humble heads to Iceland and meets the scientists monitoring the country's most dangerous volcanoes. She also investigates the biggest eruptions in Iceland's past. Show more

Twelve leading medical experts attempt to diagnose a man whose face has dramatically swollen and a woman who is sick whenever she tries to eat and is dramatically losing weight. Show more

Michael Mosley challenges a team of doctors to diagnose one young woman struggling with dramatic weight gain and hair loss and another who has suddenly lost her sight in one eye. Show more

A few weeks ago, the National Health Service was hit by a devastating cyber attack - Horizon tells the inside story of one of the most challenging days in the history of the NHS. Show more

Gordon Buchanan heads to Canada at the peak of bear season to discover what life is really like in the tiny town that's become known as the polar bear capital of the world. Show more