At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.
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Prev: Now, a company in Massachusetts says that by using magnetic brain scans, they can determine with 97% accuracy whether someone is telling the truth.
Next: In 1832, the year of Michael Faraday's discovery that a changing magnetic field produces an electric field, a young French engineer patented a new and more efficient waterwheel.
