Things About Early Humans That Will Blow Your Mind

Population Growth

It took 100,000 years for the world population to reach 1 billion. This may seem like a lot, but when we look at the other facts we will see that , it only took 133 years for that number to double to 2 billion and 44 years to reach 4 billion. One of the primary factors in evolution is the constantly changing landscape of our home, earth.