He has about him the air of restless energy and dedication that is characteristic of the breed, but his interest was slow to blossom. Son of a chemist from Canton, Mass., Scott Holmberg, 33, majored in English at Harvard. Then he joined the Peace Corps in 1971 and found himself working alone in the desolate villages of Ethiopia, struggling to learn Amharic, the country's language. It was there that the power of science changed his life. He vaccinated tens of thousands of people against smallpox as part of a team that effectively stopped...
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