The US FDA approved the Pfizer COVID-19 vaccine for emergency use.
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Climate activist Greta Thunberg was named Time magazine's Person of the Year.
Indiana became the 19th state to join the United States of America.
A trial for Huntington's disease procured positive results.
An attack was made at the UN General Assembly in New York City.
British physicist Stephen Hawking won the $3 million Fundamental Physics Prize, the most profitable academic prize in the world.
