Mark Zuckerberg founded the social networking website Facebook.
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The first Mormon Pioneers left their homes in Nauvoo, Illinois, and began the long trek to the Salt Lake Valley.
The electric typewriter went on sale for the first time in Syracuse, New York, USA.
Dr. John J. Livingood reported the first synthetic production of a natural form of radium.
The Winter Olympics opened in Lake Placid, New York.
The US Military shot down a Chinese high-altitude surveillance balloon.