US President Franklin D. Roosevelt received a letter from Albert Einstein detailing the possibility of atomic weapons.
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President Franklin Roosevelt became the first president to travel abroad during war.
Genius Albert Einstein died due to heart failure at age 76.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
President Franklin D. Roosevelt signed a 48-hour working week order to increase production during World War II.
The United States and Russia signed the Moscow Treaty, agreeing to limit their nuclear arsenals.
