Mention the words "billionaire" and "Microsoft" in the same sentence, and the mind turns naturally to the name William Henry Gates III. But Bill Gates's original accomplice, Paul Allen, is not short of a dollar, either. Like Mr Gates, Mr Allen has devoted part of his fortune to charity. But whereas Mr Gates's billions are combating various diseases that plague poor countries, Mr Allen's cash has been focused on a single project. The full title of his organisation is the Allen Institute for Brain Science, and the project-just completed—is an atlas of the brain.
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