The demand for online education is exploding. The global market for online courses is expected to reach $107 billion in 2015 . A mind-boggling figure, right? Imagine stuffing one-dollar bills into a 53-foot truck. Depending on how crumpled your bills are, you'd need around 1,000 trucks stuffed up to the roof to transport those 107-billion dollar bills. Would you like one of those trucks to deliver a heap of money to you?...