You may have heard yesterday that the world's seven billionth living person was born, which is pretty amazing considering that just 200 years ago the world population was an estimated one billion and only 1000 years ago just 300 million. How did we multiply so quickly in such a short amount of time? Thankfully, the folks at NPR have the answer. 

According to an informative video NPR put together, advances in medical science have helped to increase the average human's life expectancy while modern facilities have made it way easier to bring a baby safely into the world.

It's estimated that by 2100 there will be over 10 billion of us on earth, which is going to make it impossible to find decent parking anywhere. Check out NPR's visualization of our population explosion below.

[via Blame It On The Voices and NPR]