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Pioneer 10 becomes the first man-made object to leave the central Solar System when it passes beyond the orbit of Neptune.
Battle of Maldon: The English, led by Byrhtnoth, Ealdorman of Essex, are defeated by a band of inland-raiding Vikings near Maldon, Essex.
James Braid first sees a demonstration of animal magnetism by Charles Lafontaine, which leads to his study of the subject he eventually calls hypnotism.
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