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A lens that is capable of melt metal

One guy built a lens of small pieces of mirrors that focus at
sunbeam gets fantastic temperatures can melt metal.

















lens metal melt
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Contact lenses with megapixel display
...
Children adjustment: how it was (136 photos)
...
Hyperboloid with their hands
...
Google has received a patent for the contact lenses with a camera
...
How to choose a DVR 2015: the largest online FAQ for general consumer
...
Scientists develop sensor for contact lenses night vision
...
The Book of General Ignorance. Part 2 (30 pics)
...
"Gravity". Reality and fiction
...
Russia: Hunters plasma
...
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