NASA’s Explorer 49 was launched into Earth’s orbit to research long-range radio waves within the Milky Way.
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Italy declared war on France and Britain.
President Franklin Roosevelt became the first president to travel abroad during war.
The US signed the Equal Pay Act to reduce the difference in pay between sexes.
The Great Arab Revolt against the Ottoman Empire led by Lawrence of Arabia was initiated in Mecca.
Swedish authorities finally closed a 34-year-old inquiry into the murder of their prime minister.
