PRETEND YOU ARE DRIVING a car in the middle of a thunderstorm and you happen upon three people on the side of the road. One of them is a frail old woman, who looks on the verge of collapse. Another is a friend who once saved your life. The other is the romantic interest of your dreams, and this is a once-in-a-lifetime opportunity to meet him or her. You have only one other seat in the car. Who do you pick up? There’s a good reason to choose any of the three. The old woman needs help. The friend deserves your payback. And clearly, a happy future with the man or woman of your dreams will have an
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