These all came from:
   http://blogs.westword.com/latestword/2011/09/bizarre_classroom_posters_70s.php
   - they called it "Bizarre classroom posters" but I kinda like
   them. Now, we see posted like "Curious can be fun!" - and we've
   been trained to put an odd spin on "curious" - but really, think
   about it: curiousity is interest in learning - what's wrong with
   teaching that message? It show... "