Lord Reith would be so proud. A show to entertain and inform in one ever-so-very clever package. John Lloyd cuts the ribbon to open the third level of the Museum, revealing yet more empty plinths. Filling them with their donations this week are cosmologist Marcus Chown who, frankly, made my brain bleed with his scientific proof of the afterlife, Terry Pratchett's brilliant idea of a time bank ("the minute in your pocket will never be devalued") and Shappi Khorsandi's great anti-dictator. The guests are gold dust but curator Jon Richardson is no slacker when it comes to the sliver-sharp retort. It will make you laugh as much as it will make you think. Pornography for the brain!

John Lloyd, once a BBC Light Entertainment producer (Hitchhiker's Guide to the Galaxy, e.g.), now, after glittering adventures in TV and film, a don of the comedy world, returns with a new series of a recent invention. He and comedian Jon Richardson are pretend curators of an imaginary museum to which visiting celebrities tender possible new acquisitions. Tonight author Terry Pratchett brings a secret extra day of the week, cosmologist Marcus Chown has a plausible scientific theory of the afterlife and comedian Shappi Khorsandi offers Charlie Chaplin.

For the uninitiated, The Museum of Curiosity is presented by comedy producer/godlike genius John Lloyd, and he's joined by a different 'curator' each series; Bill Bailey, Sean Lock and now the brilliant Jon Richardson. Three contributors - comedians, scientists, authors, historians, generally fascinating people - donate something the museum each week, and that something can be absolutely anything, no matter how huge, tiny, fictional or dead. I won't give away what Shappi Khorsandi, Terry Pratchett and Marcus Chown ("cosmology consultant of New Scientist") gave to the museum in the episode I saw recorded, but I will say that all three spoke passionately about their donation, and that Chown's made my brain hurt for days. The series will air later in the Spring.