Homework research for a 7-year-old and a search trick

"Research the part of an eye and how they make you see."

The Google search "filetype:swf eye" found many interactive pages that he had great fun learning from.

I would like him to do this kind of research in school with his friends, but what made the research short and sweet was the extra "filetype:swf" added to the search string.

Also, instead of writing his research in his homework book, it would be nicer to put it in, say, http://wallwisher.com/, for his friends as well as his teacher to see, and comment upon.
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