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Two years ago at Kitzbühel, American downhiller Scott Macartney survived a high-speed crash that would've ended most skiing careers. He immediately began plotting a comeback, drawing on deep stores of willpower and courage to overcome a unique kind of terror that every racer knows. They even have a name for it: the Fear.

For more than 100 years, a swat team of brilliant scientists, pest-control shock troops, and eggheads with bizarre schemes (chicken-scented bug spray, anyone?) have been waging a global war against a foe no bigger than your fingernail. So why are we still getting murdered by mosquitoes?