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It has been 42 years since a few doctors from Yale visited Lyme, Conn., to examine 60 children who were suffering oddly with joint pain, only to coin a name for an apparently new illness called “Lyme arthritis” (although the bacterium has been around for at least a thousand years).

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DEAR DOCTOR K: I’ve heard there’s a new test that can help doctors diagnose a heart attack more quickly. Can you tell me about it? DEAR READER: A heart attack is instantly recognizable on TV and in the movies: The actor breaks into a sweat and clutches his heart. But in real life, a heart attack isn’t always so easy to identify.