Did you see this?http://www.explainxkcd.com/2012/04/02/umwelt/http://www.explainxkcd.com/2012/04/03/umwelt-follow-up/
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Did you see this?
http://www.explainxkcd.com/2012/04/02/umwelt/
http://www.explainxkcd.com/2012/04/03/umwelt-follow-up/
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