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Just for fun
Mobius Band
Cut a 50mm (2") strip from the long side of an A4 or letter size sheet of print paper.
Glue the ends together with a half twist.
Cut along its length down the middle and 1) What do you get?
Cut down the middle again and 2) What do you get?
And the last question, With the remainder of the sheet of paper, can you join the long edges together with a half twist?
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