Beethoven performed in person for the first time.
He performed the Piano Concerto No. 2 in Vienna, Austria.
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NASA's Mariner 10 became the first spacecraft to reach Mercury.
China's famous Terracotta Army was uncovered by a group of farmers near Xi'an, China.
The Sunbeam 1000 HP broke the land speed record at the Daytona Beach race track in Florida.
Niagara Falls waterfall stopped flowing due to an ice jam.
The 23rd Amendment was ratified, allowing residents of Washington, DC to vote in US elections.
