Nice high level overview of the three waves of AI (two have happened, the "Contextual adaptation" wave is yet to occur). Includes examples and successes and failures. ("Young man holding a baseball bat", indeed :) ).

"Systems construct contextual explanatory models for classes of real world phenomena" is the next goal. That is, understanding + being able to describe the reasoning for the understanding.

No technical depth, really, but lots of words to google if you want to learn more.