President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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The first US commercial bank, The Bank of North America, opened in Philadelphia.
Black men were chased away by gunmen after trying to rescue white survivors during a mine explosion.
The first telephone call was made across the Atlantic – from London to New York.
The first-ever photograph of genes was taken.
A 57-year-old man received the first transplanted heart from a genetically modified pig.
