Welcome to Science Weekly, the show that combines chin-stroking discussions about the nature of free will with a rap about particle physics.
James Randerson and the team are joined by philosopher and neuroethicist Prof Julian Savulescu. We ask, should athletes be allowed to use drugs or genetic manipulation to improve their performance at the Olympics? And what about similar manipulations in the classroom or exam hall?
We also ask magician and arch-sceptic James Randi – aka the Amazing Randi – about what conjurors can teach scientists about how the brain works. And as promised, here's the video in which Jonny Carson puts one over on Uri Geller.
Ian Sample and BA Media Fellow Marcus Pearce are also on hand to chat about finding water on Mars, a drug that mimics exercise and that rap.
Post your comments on the blog or on our Facebook Wall; and check out our Mars special page for all the latest news from the Red Planet.
