video Daniel's Solar Cooker
This solar heat ray can produce temperatures exceeding 1800 F� at 10 feet focal length to 300 F�  at 100 feet focal length.
GREENPOWERSCIENCE (author) 2 years ago
Smaller quick version:

radicalmart2 years ago
brilliant! a superb way of harnessing free power for something useful
GREENPOWERSCIENCE (author)  radicalmart2 years ago
thank you:-)