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From spiders to stinging nettles, bees to boy bands and twins to thermal undies, you'll wonder why these questions hadn't occurred to you before - but you'll never forget the answers and will want to share them with all your friends.

Which lottery numbers should I pick?
Is it true that we are made entirely of stardust?
Can dogs tell the time?
Why do songs get stuck in my head?
If Rome wasn't built in a day, how long did it take?
How do you wash a raspberry?
What is the most expensive thing on Earth?
Where is last Wednesday?

For more from the team behind QI, visit qi.com. You can also follow QI's fact-filled Twitter account @qikipedia and listen to their weekly podcast at nosuchthingasafish.com