The global population is expected to reach 7 billion today, just 12 years after hitting 6 billion.
How much is 7 billion?
Seven billion seconds ago, the year was 1789. That was the year George Washington was inaugurated as the first U.S. president and Congress met for the very first time. If you took 7 billion steps along the Earth's equator - at 2 feet per step - you could walk around the world at least 106 times.
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