- 1x1 inch square of wood
- sewing needle
- 3x3 inch square of paper
- 1) Using a drop of glue, glue the needle to the wood
at a right angle. You may have to hold the needle for a moment while the
- 2) Fold the square of paper diagonally (into a
triangle) then unfold. Fold the paper diagonally the other way and unfold.
The square should now have 2 folds making an X in it, and should look like a
low, slightly flattened pyramid.
- 3) Place the wood-and-needle assembly in front of
you. Balance the paper on the needle by placing the point of the needle
where the two folds meet.
- 4) Rub your hands together 5 to 10 times, then cup
them around the pyramid about 1 inch form the paper.
Explanation: When you rub your
hands together, the friction makes them warmer. Heat always moves from warmer
to cooler objects. The air around your hands is cooler than your hands, so the
air heats up and rises, because warm air is lighter than cool air. As cooler
air takes the warm air's place, a wind is created, and that is what moves the
paper. The movement of air or liquid like this is called convection.
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