We've all learned to recognize the international symbols for restrooms, if nothing else, but you probably know a lot of them. But where did they come from in the first place? Rob Lammle at mental_floss takes you back to Vienna in the 1920s for the real origins of the "pictograms" we see every day. Link
http://www.neatorama.com/2010/02/28/olympic-pictograms/ for an old Neatorama article.
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