hot or hoax
 

http://www.youtube.com/watch?v=ptUj8JRAYu8

am still dont know if thrue :confused:


now this site is something else, http://www.free-energy-info.co.uk/
free energy patent cemetery .Hopefuly they did not get burry to deep and can be revived.

Well, the desert sun is very hot, but the focal point did not look concentrated enough to make sand melt into glass, or a glass like substance.
But if you can focus the sun enough, then you could make sand melt into a glass like substance.
But if the video is true or not, I really don't know.