Quick: take this sorry, confused patient away from the newest cover of Fortune and back to his ward—and warn the rest of the vain techie hot shots that the era of the hilariously ill-advised magazine cover is back.

In this month's issue of Fortune, we "meet the most important young iconoclasts, risk-takers, and rule breakers in business"—40 of them, to be exact. At the top of the 40 Under 40 prestige pile is Yahoo! CEO Marissa Mayer, who, despite lavish press, has accomplished about as much for Yahoo! as you have.