Green Power science has another video
http://www.youtube.com/watch?v=1J-nB7-jIJo&feature=youtube_gdata_player
The interesting thing about this video is the simplicity: use stretched plastic and water and something to put the stretched plastic over in order to collect the water.
This will focus the sun rays hot enough to burn wood. See the video.
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Al Fin: "Cowboy Commentary", aka "Eat your veggies" The Flag banner is posted in order to defy those who would make patriotic symbols illegal or disreputable.
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