17 7/8 x 8 1/8in (45.4 x 20.6cm) sheet 21 3/16 x 9 1/4in (53.8 x 23.5cm) ...

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One-sided objects are surprisingly common – and misunderstood. What are they, and how have they helped us understand the world? You have most likely encountered one-sided objects hundreds of times in ...

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