Bill Gates had a pie thrown in his face while visiting EU officials in Brussels, Belgium.
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Mark Zuckerberg founded the social networking website Facebook.
The first Mormon Pioneers left their homes in Nauvoo, Illinois, and began the long trek to the Salt Lake Valley.
The Winter Olympics opened in Lake Placid, New York.
Doctors in New York successfully performed the world's first face and double hand transplant.
The US Military shot down a Chinese high-altitude surveillance balloon.
