http://www.bbc.co.uk/schools/scienceclips/ages/7_8/light_shadows.shtml
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwjNvvm_jZjUAhWHWSYKHdtRDfwQFghAMAU&url=http%3A%2F%2Fwww.childrensuniversity.manchester.ac.uk%2Finteractives%2Fscience%2Fearthandbeyond%2Fshadows%2F&usg=AFQjCNFLtRF8uf8ZOWVHpElV4xBRnnFdcA
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