“Have you any idea what it takes to catch a ball, or raise a cup to your lips, or make immediate sense of a word, a phrase or an ambiguous sentence? We didn't, not at first. Solving maths problems is the tiniest fraction of what human intelligence does. We learned from a new angle just how wondrous a thing the brain is. A one-litre, liquid-cooled, three-dimensional computer. Unbelievable processing power, unbelievably compressed, unbelievable energy efficiency, no overheating. The whole thing running on twenty-five watts -- one dim light bulb.”