"The more fundamental issue is that brute-force computation cannot compare with the functioning of a real brain. Human intelligence arises not from logic, but from our ability to respond to ambiguity and adjust to rapidly changing situations. "The idea that human expertise can be formalised in logical rules turned out to be a fundamentally wrong assumption,” says Rolf Pfeifer, an AI researcher at the University of Zurich in Switzerland.”
Even more interesting:
"A brain consumes less power than a light bulb, and occupies less volume than a 2-litre bottle of soda,” says Dharmendra Modha, a computer scientist at IBM.