There is a great educational resource available on the web: card models.
I remember first1 making such models as a small child. I can say from memory that folding paper and card in three dimensions is a great way to get an intuitive feel for three dimensional geometry.
The great thing about making models as a child is that you don't realise just how much science you are learning. With guidance from a good teacher, small children can learn a lot about the universe just from making models.
What causes earthquakes?
What's inside a volcano?
Build an observatory and then calculate where to aim your telescope.
How does a hydroelectric power station work?
All these and more are available to download as free .pdf files, thanks to the generosity of their artistic creators and Canon Inc.
[1] - 'first' might seem to imply that I still make them. And why not? :-)
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How to thank me for bringing this wonderful educational resource to your attention?
Oh, Lord!
Won't you buy me a Mercedes-Benz?
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