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Math Trek

Recycling Topology

By
4:45pm, April 22, 2003

It's hard to miss the triangle of three bent arrows that signifies recycling. It appears in newspapers and magazines and on bottles, envelopes, cardboard cartons, and other containers.

But have you noticed that there are two versions of this ubiquitous symbol? The difference between them lies in the direction of the twist in one of the three chasing arrows that m

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