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3 Different Ways to Build Fires with Optics

optical-fire[1]

It’s strange to think that the light of the sun can light fires here on earth, but with the right concentration of sunlight—it’s surprisingly easy. For those of us who burned ants with magnifying glasses when we were mischievous children, we already know one way to make a white-hot spot of burning heat with a lens, but did you know there are other ways to turn sunlight into fire?
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