When our children were little, we spent a lot of time in the kitchen together. We used the occasions to surreptitiously teach them about science: heat and temperature, fluid flow, density, viscosity, physical changes, chemical reactions, acids and bases.
An interesting conundrum came up when we used the cookie cutters: they left gaps between each shape we cut out. To use up all the dough, it had to be rerolled. But then it warmed up and had to be chilled before we could cut it again.
Being a mathematician, I had heard about tilings and tessellations, which refer to the covering of a surface, using one or more geometric shapes, with no overlaps and no gaps. That was the answer to the cookie cutter problem!
It was possible to make custom cookie cutters, and then it became a matter of choosing the shape. Many figures can be used to tessellate, such as regular or irregular triangles, rectangles.
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