Brainy grandson requires special Christmas pressy

[itsmefolks]

My Grandson aged 9 is a bit of a brainbox. I am trying to find something for him for Christmas that will assist in his natural bents.
He has a curiosity for the stars, fossils, and electrical things and is rather good at fixing things!! I have seen him do 2 jigsaws at one time. Last week he solved a puzzle that had an Aerospace engineer baffled all day in less than 5 mins. He also spends hours upon hours inventing as he calls it, things with his lego with gears and winches that really work. Most leaves me completely baffled. I have got him a microscope for his birthday which he loves. But I am now thinking of something for Christmas and am completely stumped. Any suggestions of books or shops that may assist would be appreciated very much.
Thanks in advance.

[Answerprancer]

..actually they're not too bad - around £30

[itsmefolks]

Oooooh nice ideas. Thanks.

[hellywelly4]

How about a Meccano set?

[jake-the-peg]

Electronics kits are often good

Or how about this?

http://www.maplin.co.....aspx?moduleno=266257