QI

In a series famous for facts, here's a killer one: of the things QI presented as true in its first series, 60 per cent are now thought untrue. Stephen Fry announces this near the start of a landmark (and very funny) edition where he explains "the half-life of facts" - scientists revising knowledge about how many moons the Earth has, for instance - and makes recompense for all the points that should have been awarded over the years for answers that have proved to be right, as a result of which Alan Davies is retrospectively awarded... 737 points.

Davies is on good comedy form, pretending to pluck the legs off a millipede or describing his stealthy mother-in-law. We also learn how the Romans avoided forgetting names and how 19th-century Germans realised birds fly south for the winter - a flabbergasting story.

QI: what do you get if you cross a whale and a dolphin?

A quietly intriguing column from the brains behind QI, the BBC quiz show. This week: QI on dolphins.

QI: Some quite interesting facts about Danes

A quietly intriguing column from the brains behind QI, the BBC quiz show. This week: QI has a Danish.

John Lloyd mulls over stage version of QI

Lloyd is mulling the potential for a stage version of QI.

QI: what's the heaviest living thing on earth?

A quietly intriguing column from the brains behind QI, the BBC quiz show. This week: QI is out of its tree.

QI crustacean facts: woodlice don't urinate

An intriguing column from the brains behind QI, the BBC quiz show. This week: QI gets into a crustacean situation.

Look out for a revealing exchange tonight between Stephen Fry and Alan Davies, comedy's most unlikely double act. They're friends off-screen, and there's a lovely spat where Fry grumbles under his breath that Davies didn't invite him to his wedding. "I DID invite you but you didn't come!" Davies protests, and Fry has to bury his head in his hands in shame as Davies reminds him that it was filming an episode of Bones that kept him away.

Aside from these recriminations, it's the usual pattern of recent QI episodes: Fry answering his own questions at length while the panellists chuckle along. Along the way, there's a detour into bestiality, some amusing Korean sayings and the timeless line: "Are you ready for me to pump the custard?"

QI on gas: how much gas does the average human produce?

A quietly intriguing column from the brains behind QI, the BBC quiz show. This week: QI's all right now - in fact, it's a gas.

It's a round titled "Kit and Kaboodle" and Stephen Fry wants to know if there's a use for kitty-litter that doesn't involve cats. Alan Davies tries to be helpful, but his contribution ("In an episode of Jonathan Creek I weed into some cat litter") isn't quite what Fry is after. Ross Noble and Noel Fielding, with Australian comic Colin Lane, can't quite lift the episode off the ground.

But there are some bright bits, including Fry demonstrating martial arts on a pile of three bricks: "This takes extreme focus and extreme pain," says Fry, wincing in agony.

John Lloyd: the brain behind QI

You probably haven't heard of John Lloyd - but this self-described Stoic, whose career was derailed by depression, has probably made you laugh more times than anyone else.