It is almost night on the Kalahari Desert in southern Africa. As the sun sets, the sky turns red, then purple, then black. Ketwago watches the stars come out. He believes they are the eyes of people…
Measuring time by the sun or the stars is all very well, but people soon needed a better way. And this need led to the invention of the water clock. The first water clock was just a large clay or…
Materials – paper (large sheets) – scissors 1. Square your paper (see square, page 38). Cut off the rectangle, but leave the paper folded so that it is a triangle. Fold the triangle in half, as…
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