CGP Grey presents a new video of time length 5:14. Should all locks have keys? Phones, Castles, Encryption, and You. https://www.youtube.com/watch?v=VPBH1eW28mo Ken -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.fsr.com/pipermail/vision2020/attachments/20160414/1fd477eb/attachment.html>