A 57-year-old man received the first transplanted heart from a genetically modified pig.
The Sahara desert was blanketed in snow.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
The iconic Leaning Tower of Pisa leaned 'too far,' which resulted in its closure.
President Truman announced to the people of America that they successfully developed a hydrogen bomb.
The first-ever photograph of genes was taken.
The distress signal 'CQD' was established.
Black men were chased away by gunmen after trying to rescue white survivors during a mine explosion.
The US celebrated the opening of the country’s first railroad station in Baltimore.
Italy used its current tri-colored flag for the first time.
The first US commercial bank, The Bank of North America, opened in Philadelphia.
Galileo discovered the first three satellites of Jupiter.
French forces attacked Calais and took it back from English rule.