At this time of year, everything seems to be decorated with some kind of seasonal design – trees, holly, jolly Santas and so on. One shape you often see is a snowflake. Yes, they are beautiful and ...
To most people, “symmetry” means the bilateral symmetry exhibited by, say, a butterfly, or the human face. That is, if you take a picture of a butterfly and draw a straight line down the middle of the ...
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