While the painting's unfinished nature may be seen as a weakness, it is a window into the mind of a master.

ECONOMIST: Portrait of a lady and her daughter

Jobs' diet is only the latest example of a high-profile technologist using mind to master matter.

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Whether I am delivering a speech on leadership before a corporate audience, issuing a final report on business in China to a client company's board, or trying to sell my firm's services, there are three key rules I keep in mind to get over my fears and be a master public speaker.

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