Who is an Entrepreneur?

Going through Vinod Khosla driven Khosla Ventures, the term "Who is an Entrepreneur" struck me.

Here it is:

"An entrepreneur is someone who dares to dream the dreams and is foolish enough to try to make those dreams come true."

"Innovative bottom up methods will solve problems that now seem intractable- from energy to poverty to disease.
Science and technology, powered by the fuel of entrepreneurial energy, are the largest multipliers of resources we have to solve our many social problems."