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In which we check on one last rocket project from the 2019 Wheaton Labs Appropriate Technology Course, melting broken glass into something more interesting in a Rocket Heater. Here's the idea: Melting bottle glass requires sustained temperatures up to 1600 degrees Fahrenheit with a long slow cool down to strengthen (anneal) it. So where do I find temperatures like that without a massive expenditure of fossil fuels? Try the heart of my Rocket Heater on any cold winter night.
