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The giant Fresnel lens liquefies metal, allowing it to flow into a mold. It's science and entertainment rolled into one!
Web site: http://www.brotherswhitney.com/2008/11/light-and-heat/
Brothers Whitney
Dick was born and raised in Florida, where he built all manner of dangerous and entertaining things. Now invents alternate futures and tinkers with reality in his spare time.
http://www.brotherswhitney.com/