How is glass made?
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The process that turns sand into glass is very cool \\u2013 or rather, we should say very hot. Very, very, very hot as it turns out. Humans have been turning minerals from the earth\\u2019s crust into glass for 3,500 years. Find out how it\\u2019s done and how it\\u2019s evolved \\u2013 from blowing glass by hand to a factory that makes hundreds of glass bottles every minute. Plus: The mystery sound!
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