Udacity

OK, you use your smartphone all the time: you use the latest and greatest apps, you can text or tweet with the best of them, you have the knack for selfies, and so on.  You probably also have a computer, tablet, and a gaming system, each of which you are also very proficient with.  No question: you are a whiz with electronic devices. But, if you're like most of us, you don't really know how or why they work. Maybe that's OK.  Most of us don't know how our cars work either, couldn't explain how heavier-than-air flight is possible, have no idea what the periodic table means to our daily lives, and would be in trouble if our lives depending on us making, say, bricks or glass...