US President Franklin D. Roosevelt received a letter from Albert Einstein detailing the possibility of atomic weapons.
Source
President Franklin Roosevelt became the first president to travel abroad during war.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
Albert Einstein warned against hydrogen bombs on the ''Today with Mrs. Roosevelt" weekly TV show.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
North Korea performed a controversial intercontinental ballistic missile test.
