A Japanese scientist, Shibasaburo Kitasato, isolated the bacterium of the Bubonic Plague.
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The first daily passenger air service began, going from London to Paris.
Alicia Thornton became the first British female jockey after taking part in a horse race at York Racecourse in Knavesmire, England.
Naturalists Chris Atkins and Michael Taylor discovered the world's tallest tree in Redwood National Park, California.
Walden W. Shaw and John D. Hertz founded the Shaw Livery Company and introduced the yellow cabs to attract passengers.
The doctrine of the Holy Trinity was established after the end of the Council of Nicaea.