The Terminator

Elizabeth Holmes is serving prison time for fraud after convincing the world she had developed a simple blood test that could diagnose a range of diseases. Professor Duncan McGillivray looks at whether the fiction could one day be a reality.

Wonder Woman can stop bullets with her Feminum bracelets but, apart from needing the reflexes to achieve this, could any material that's light enough to wear on your wrists do that?

Kate Andrew tackles Terry Pratchett's Discworld series of books in this episode, with a particular focus on the Octiron, the element of magic which makes up the disc's hub.