President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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The first telephone call was made across the Atlantic – from London to New York.
Italy used its current tri-colored flag for the first time.
A 57-year-old man received the first transplanted heart from a genetically modified pig.
The iconic Leaning Tower of Pisa leaned 'too far,' which resulted in its closure.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
