I came across a an article this morning that suggests that the Nook and the Kindle have changed things in such a way that schools are becoming obsolete.

Agreed; soon there will be absolutely no need for a an education!

That is indeed the difference between "discover" and "invent" which most English speakers would probably agree on being the correct one. Etymologically, however, the word "invent" originates from the Latin verb invenire, which literally means "to find" or "to discover". That particular meaning, once incorporated into English, remains in certain authoritative dictionaries and thesauruses, such as the aforementioned Oxford Thesaurus of English:

invent
verb
1. originate, create, innovate, design, device, contrive, formulate, develop
2. conceive, think up, come up with, hit on, mastermind, pioneer
3. discover, find
4. coin, mint

I do think that what constitutes a language should largely be determined by common use if there are already perfectly cromulent replacements for certain words. Still, I would still be hard-pressed to call anyone wrong even if they made a crazy-sounding claim like "Christopher Columbus invented the Americas in 1492" as long as I know that they have the means to point and laugh at me for appearing oblivious to how their slightly obscure use of English is correct.

Hopefully, the "invent" => "discover" semantic implication will soon become archaic, so that I will never under any circumstances be tempted to drag discussions off topic like this again.

(It's actually a semantic logical equivalence. Did you know that the Wright brothers discovered the first powered airplane in 1903?)

You are missing my point. Henri Becquerel invented radioactivity itself (not just the scientific theory of it), despite radioactive decay taking place before he or anyone else we know of knew about it. If he had somehow given rise to the existence of radioactive decay in the universe, he could also have been said to have invented radioactivity, but "invented" no longer directly conveys the semantics of "discovered" in that case.

Actually, Henri Becquerel invented it. A good thesaurus (such as Oxford Thesaurus of English) will show you that invent is, annoyingly, synonymous with discover.