Narciss Okhravi, consultant ophthalmic surgeon at Moorfields Eye Hospital, helps Kent Valentine to understand how vision works, and shares a few tales from the front-line of an Eye Hospital casualty department. She also reminds him that he needs an eye test!

Martin Austwick, medical physicist from the National Medical Laser Centre, and Kent Valentine try to get their heads around photo-dynamic therapy, quantum computing, and what makes a "proper" Doctor. Hosted by Steve Cross.

Lucie Green, space scientist at the Mullard Space Science Laboratories, and Kent Valentine, comedian at large, try to get their heads around the sun. This podcast is supported by the Science and Technology Facilities Council.