Facts about 21

1. 05

   During the 2016 Summer Olympics in Rio de Janeiro, 19-year-old Simone Biles won four gold medals in artistic gymnastics, becoming one of the most decorated American gymnasts.

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2. 04

   Adele's debut album 21, released in January 2011, became the best-selling album of the entire decade with over 31 million copies sold worldwide.

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3. 03

   Legal drinking age across most U.S. states was raised to 21 in 1984 following the National Minimum Drinking Age Act signed by President Ronald Reagan.

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4. 02

   In blackjack, a hand totaling 21 with two cards—an ace and any ten-value card—is called a natural blackjack and pays 3 to 2 in most casinos.

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5. 01

   The atomic number 21 corresponds to scandium, a silvery transition metal first isolated by Swedish chemist Lars Fredrik Nilson in 1879.

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