One of the most underutilized energy sources (although they are making progress) is solar power.  This creative DIYer has made a very clever “aqua lens” which uses water and the sun.  Here is how he describes this device:

This solar water lens that is almost 30 inches in diameter is grid free energy and can burn through wood quickly. It delivers a very large powerful focal point that is only useful around noon in the summertime when the sun is directly overhead. The material is crystal clear vinyl shower curtain. This lens concentrates about 500 watts of solar heat energy to a focal point of 1 inch optimal with a 3-6 inch scatter.

Let’s check this thing out in action in the video on page 2

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