When I was young, Brontosaurus  was a thing, East Germany was a place, Pluto was a planet, and there was exactly one star we were sure had any planets at all - ours.  Now all of that's wrong.  How many globes, atlases, textbooks and encyclopedias are even usable anymore?  It's one of the strongest practical arguments I can think of for migrating to a digital, collaborative version of educational materials.  We learn so much, so fast, and overthrow old ideas so regularly that calling any of this information "fixed" or "finished" just seems ridiculous.  So read the attached article on exoplanets - a term that didn't really exist even 10 years ago.  A whole new field.  What new field will exist 10 years from now?  How many of our current ideas will it overthrow?  I can hardly wait.