President Harry Truman opened the two-lane White House bowling alley.
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Bell Labs demonstrated the first practical silicon solar cell in New Jersey, US.
Germany banned the denial of Nazi genocide against Jewish people during the Holocaust.
The Peloponnesian war came to an end when Admiral Lysander and his Spartan armies defeated their Athenian foes.
Romania and Bulgaria signed the European Union's Treaty of Accession, the last step to joining the Union.
The Thornton Affair, a skirmish between American and Mexican soldiers in Texas, started a chain of events that led to the Mexican-American War.
