The Mayan calendar started being used.
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A three-year-old boy from Dublin became the world's youngest heart and lung transplant patient.
Supergiant Games released their most ambitious game to date, Hades, on PC, Switch, and macOS.
John Smith, famous for setting up the first permanent English colony in the New World, told the first stories about Jamestown.
Iranian mathematician Maryam Mirzakhani became the world’s first woman to win the Fields Medal, the most prestigious award in mathematics.
Inventor William Gray received a patent for creating the telephone that uses coins to operate it.
