President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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The Sahara desert was blanketed in snow.
French forces attacked Calais and took it back from English rule.
The first-ever photograph of genes was taken.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
A 57-year-old man received the first transplanted heart from a genetically modified pig.
