January 5, 1900 (Friday)
- In Baltimore, Physicist Dr. Henry A. Rowland of Johns Hopkins University announced that he had discovered that the cause of the Earth's magnetism was its own rotation, based on experiments to produce magnetism by the rotation of a motor.
- In film, January 5, 1900, provides the opening of the 1960 George Pal production of The Time Machine, with the traveler having returned from 802,701 AD.
- Born: Yves Tanguy, French painter, in Paris (d. 1955)
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