Udacity announced in November for-pay MOOC classes: http://blog.udacity.com/2013/11/udacity-innovation-is-in-our-dna.html
I've signed up for MOOC classes that seemed interesting, but once I started I realized the subject matter wasn't what I had thought, or that the instructor's style didn't suit me. So I abandoned those classes. I guess I show up as a "failure" as far as the MOOC goes, but I don't think it really reflects my inability to master the material. So it's not just about being able to repeat until mastery is obtained - it's about being able to check courses out.
Good thing no terrorist can afford to fly first class where they still have metal utensils with meals. And good think no terrorist would think to bring aboard a duty-free liquor bottle they could smash into a sharp weapon. Good thing that the scissors, screwdrivers, canes, high heels, stems of eyeglasses, etc., etc. people are allowed to bring on board couldn't possibly hurt anyone. Good thing the TSA has protected all of us from all possible harm on flights with their wise and discerning policies.
I second that. Not extremely technical, but a good first read about relational databases, normalizing, etc.
But how can they be sure the kid didn't actually eat some nuts? It's urban legends like this that spread unnecessary fear?
This is only partly true (only a very small part) and much less so now.
The drug companies did sponsor some thin "throw-away" quick reference books on narrow topics. With the crackdown on drug companies, this is much less true now.
Drug companies didn't and still don't fund or write any of the major medical reference texts that are used primarily. They would sometimes buy them to give away to doctors (again, this happens much less now), but they didn't have input on the content. I've edited major medical texts, and know the editors of other leading texts, and know that drug company concerns had nothing to do with the content.
I spent my teen and pre-teen years building electronics from freely-available plans. But we never called it "open source" back then, so why start now?
Um, because we have a good general purpose term for it now that wasn't in use when you were a pre-teen?
Do you suffer painful illumination? -- Isaac Newton, "Optics"