How to make a solar tower

1. Make your fan
You’ll need a rectangle of black card around 30 centimetres long and 25 centimetres wide. You’ll also need a piece of paper, some scissors, a long pin, two similarly thick books and a small strip of card. Once you have these items, cut a square of paper ten centimetres wide, then make a cut from each corner towards the middle of the square, around two-thirds of the way to the centre.

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