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We use your Giant Test Tubes to make small solar ovens that work really well. Over the years we have seen many designs that ranged from completely ineffective to downright dangerous. We don’t want to hurt kids with an advanced design or turn them off to solar with a design that does not work.
This one is simple, functional, durable and easy to build with simple and safe tools. It will heat water for hot chocolate or soup to temps around 150. This idea is from Todd Blackman at the Franklin County Public Electrical Utility District #1 in Pasco, WA.
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