A clever set of warning signs you'll likely to encounter in the far future, made by Flickr user Arenamontanus: http://www.flickr.com/photos/87547772@N00/sets/72157594323393196/ [flickr]
These are part of a post Anders Sandberg wrote about future technologies and the dangers to humanity that they may create: http://www.aleph.se/andart/archives/2006/10/warning_signs_for_tomorrow.html
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