How we see things (reflecting surfaces)
http://www.bbc.co.uk/schools/scienceclips/ages/10_11/see_things.shtml
Mirrors
http://www.sciencekids.co.nz/gamesactivities/howwesee.html
Light and shadows
http://www.bbc.co.uk/schools/scienceclips/ages/7_8/light_shadows.shtml
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