stackyFACTSTake a ribbon, give it a half-twist, and tape the ends together. You have just destroyed the concept of top and bottom. If you trace a line along the surface, you will cover the entire object and return exactly to the start without ever lifting the pen. It is a one-dimensional prank played in a three-dimensional space.
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John Venn decided that rigid academic logic simply wasn't visual enough for standard comprehension. He started drawing overlapping circles to forcefully…
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