President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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A 57-year-old man received the first transplanted heart from a genetically modified pig.
Black men were chased away by gunmen after trying to rescue white survivors during a mine explosion.
The iconic Leaning Tower of Pisa leaned 'too far,' which resulted in its closure.
Akihito succeeded his father to become the 125th Emperor of Japan.
The first-ever photograph of genes was taken.
