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D. Russell Humphreys, Ph.D. - "Predictions have value," writes a prominent space scientist about planetary theories. "The classic test of a theory," he says, "is its ability to predict. Successful predictions are so rare that they are usually regarded...

D. Russell Humphreys, Ph.D. - The earth's magnetic field has been a mystery to man ever since 13th-century philosophers first noticed lodestones (magnetic rocks) turning north.1 In 1600, A.D. William Gilbert, Queen Elizabeth's physician, shed light on the mystery by showing...

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