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How many years are there in a century?
Great, you answered "10".
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Interesting fact:
We currently live in the 21st century. Our world is filled with iPhones, Twitter and twerking. The global population is over 7 billion and in less than 100 years, it is estimated that number will rise to 10 billion. Things have changed a lot over the years, especially since the original century. In the first century, there were only around 200 million people on Earth!