Napoleon Bonaparte left Egypt to return home to France.
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Chris Messina Tweeted #barcamp, which became the first use of a hashtag on Twitter.
The first-ever photograph was taken of the Earth from the surface of the Moon.
Mars had a 'close encounter' with Earth at 34.8 million miles apart.
During World War I, Japan officially declared war on Germany.
The first-ever message was sent from a ship to the shore at Cliff House, San Francisco.
