Dr. CIAVARELLA: My normal heart rate at cycling in normal conditions - flat roads, normal wind at 24 to 25 miles an hour - would be about 130, 120.

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It's where the majority of people wind up, even though there is no such thing as a "normal" human being.

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This time, down through Normal, Illinois, from high up in white Minnesota, dead of winter, icy roads, wind blowing sideways across the empty cornfields.

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During a short cycle the solar wind (a breeze of electrically charged gas blowing off the sun's surface) is stronger than normal.

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