cartoon of people and planetYeah, yeah, you know — the world population is hitting 7 billion this year. Here are some facts about the world’s people that you might not already be familiar with.

50,000 — years it took for the human population to reach 1 billion, in 1800 1

12 — years it took to add the latest billion, in 2011 2

12 — projected number of years it could take to add the next billion, by 2023 2