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.
Swedish company Saab, previously known for making aircraft, produced their first automobile.
The first class of students graduated from the United States Naval Academy.
President Franklin Roosevelt became the first president to travel abroad during war.
The Great Arab Revolt against the Ottoman Empire led by Lawrence of Arabia was initiated in Mecca.
