Hey! Browsing the web, I came across a pretty interesting idea(at least for me) which I haven't seen people in this forum discuss. http://en.wikipedia.org/wiki/Moravec's_paradox In just says that high level human cognition is a much easier problem for AI researchers to solve compared to sensorimotor skills. This is because those skills where evolving for far longer than human reasoning. I'm not sure it includes common sense though. Maybe you'll find it interesting too!