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Dr. Henry F. Lee had an early interest in nuclear physics when it was a very young science and before he switched to medicine. His continuing interest is manifest in this article. He is an associate professor of pediatrics at the University of Pennsylvania, and Director of Pediatrics at the Chestnut Hill Hospital and has maintained a busy office practice in Philadelphia since 1947. Forthcoming in the near future is a book for parents based on his practice experience.

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