The first US commercial bank, The Bank of North America, opened in Philadelphia.
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The first-ever photograph of genes was taken.
The US celebrated the opening of the country's first railroad station in Baltimore.
President Truman announced to the people of America that they successfully developed a hydrogen bomb.
A 57-year-old man received the first transplanted heart from a genetically modified pig.
The Sahara desert was blanketed in snow.
