20 Most Useless Inventions Ever Made
The German aviator Otto Lilienthal (1849 - 1896) demonstrating the first glider he invented. (Photo by Rischgitz/Getty Images)
From glue sticks filled with butter to shoes with an in-built air conditioning system, we count 20 of the most bizarre and utterly useless inventions some people actually believed might take off in mainstream culture.
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