Computer science is not about machines, in the same way that astronomy is not about telescopes. There is an essential unity of mathematics and computer science -- Mike Fellows (often attributed to Dijkstra, but first published by Fellows in 1991 in "Computer SCIENCE and Mathematics in the Elementary Schools")
Harry Eng, creator of impossible bottles. Each bottle is filled with seemingly impossible to fit objects. Designed and created to make you think. You can check out more at the Puzzle Museum.
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