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21 months is what a US$1 bill lasts.
Giraffes’ tongues grow up to 21 inches (53 cm) in length.
All mammals take about 21 seconds to pee.
Breathing the air of Beijing has the same health risks as smoking 21 cigarettes a day.
Mahatma Gandhi survived 21 days with no food and with only sips of water.
When Stephen Hawking was 21 years old, doctors gave him a life expectancy of two years more.
1 out of every 21 New Yorkers is a millionaire.
The founder of WhatsApp went from an immigrant on welfare to selling his app for US$19 Billion in 21 years.
It is estimated that the average person in the U.S. will have spent some 10,000 hours gaming by the time they are 21 years old.
21% of all New York City elementary students from all income levels are obese.
An average adult’s skin spans 21 square feet (2 m2) and weighs 9 pounds (4 kg).
Puerto Rico has more American citizens than 21 U.S. states, but can’t vote in presidential elections.
Sean Connery wore a toupee in all of the James Bond movies because he started balding at age 21.
21% of Americans believe in witches.
Traveling to every single stop of the New York City subway (without leaving the transit system) would take at least 21 hours and 49 minutes.
Of all the countries that celebrate an independence day, 58 are independent of the UK, 26 of France, 21 of Russia and 21 of Spain.
Those who don’t eat breakfast have a 21% higher risk of developing diabetes than those who do.
When Michael Jackson was 21, he wrote a personal note promising to re-invent himself as the greatest entertainer of all time.
Arthur Guinness, founder of Guinness Brewery, had 21 children with just one wife.
A 2-hour movie plus 5 minutes of previews uses 2.1 miles (3.4 km) of 35mm film.