I wonder, can entrepreneurship really be taught? How?

One of the subjects as part of a post-grad diploma I took was "entrepreneurship" and it covered stuff from the idea phase right to the (including a business plan) actual launch. Its nice to know all those 'text book' things but the key things, some which the antman has mentioned are not taught in structured learning environments but can be taught or acquired. Like everything else in life, having a vision and the commensurate drive to see it through cannot be taught...