In this video I test out my new giant Fresnel lens. I show how it ignites wood in about 1 second. Then I stick a rock under the lens and it immediately starts popping do to the extreme heat. The rock ...

Fresnel lenses are all around us, but this vase puts the commonplace technology to work in an entirely new way. Borrowed From Old Lighthouses, A Method For Super-Powerful Solar Power With the help of ...