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''Professor Stewart's Hoard of Mathematical Treasures'' is pitched at the perfect difficulty level: it's clearly and intelligently written, so that you won't require anything other than a basic secondary school knowledge of maths, yet it's not dumbed down and doesn't shy away from anything complicated. Anyone with a slight geeky bent to them, whether they be adult or teenager, will find plenty to edify, tickle and tantalise them. It'd make a wonderful present for anyone with at least a passing interest in maths and puzzles. I can't wait for the next volume. Highly recommended.

[[How To Make A Tornado by Mick O'Hare]] is another collection of curiosities, this time from the world of science rather than maths. [[The Tiger that Isn't by Michael Blastland and Andrew Dilnot]] gives you the tools you need to deconstruct the numbers which are pushed at us day in, day out - it features in our [[Top Ten Books For Slightly Geeky People]], which is also worth a look.