blue sky photo credit: http://www.google.com/imgres?q=blue+sky&um=1&hl=en&safe=active&client=safari&sa=N&rls=en&biw=1478&bih=615&tbm=isch&tbnid=HliJvHaI02kzBM:&imgrefurl=http://physicsforus.wordpress.com/physics-3/physical-optics/a-light-polarization/&docid=_xmFXFtMp1-HVM&imgurl=http://physicsforus.files.wordpress.com/2011/07/blue-sky-background.jpg&w=1280&h=1024&ei=QxqcTsDdH6P50gGAy-TPBA&zoom=1&iact=hc&vpx=185&vpy=285&dur=420&hovh=201&hovw=251&tx=67&ty=107&sig=105755758275664001886&page=1&tbnh=135&tbnw=180&start=0&ndsp=21&ved=1t:429,r:7,s:0&surl=1
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