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Periscopes were invented to observe things from a hidden position. They were used to see above water from submarines, in all directions from inside a tank, and above ground from trenches by soldiers during World War I.You can learn how to make a periscope to use in the pool or peak around the corner into the kitchen to see what’s for dinner! Learn how to make a periscope, and build one.
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Fecha publicación: 12.5.2016
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