by Jim MartinThe sun is free for everybody to use. Irrespective of religion and nationality, the sun shines upon all of us in all its glory. Since the very dawn of history, the sun has been showering its light and warmth upon us. Thanks to modern science and technology, man now has the knowledge and know-how of harnessing a part of the tremendous energy contained in the sun and pitting it to various uses.Whenever one talks about solar energy, the first picture that comes to the mind is that of t