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Simple survivalist tip to starting a fire when camping.
Parabolic Reflector for Solar Cookerby ohneschuh
Make a parabolic solar dish from an 8 by 4 sheet of plastic (without too much waste)by gaiatechnician
Instant Parabolic Trough #8 stainless steelby GREENPOWERSCIENCE
Build a simple parabolic solar stillby cobergland
Parabolic solar ray gun a.k.a solar death rayby kishida
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