Because most of essential problems are already solved, you can only find solutions for unsolved small problems that interests only small group of people. I dis

Because most of essential problems are already solved, you can only find solutions for unsolved small problems that interests only small group of people. I disagree. Some huge problems remain unsolved because they are big beasts to tackle. Education, for example, is ripe for disruption, and while there have been some advances (Khan Academy, Edx), we have a long way to go before you can get a respected degree online.