Humanity's Astounding Growth to 7 Billion People [Video]
There are many ways to tell the story of humanity’s explosive population growth over the last 200 years, which recently culminated (sort of) in the birth of the 7 billionth child. In their video, NPR chose a series of water-filled glasses that drip water out as they are filled. The exiting drips show the births, and the fresh water entering the glasses are the births.
It’s an interesting and surprising look at the spread of ours species. It’s also guaranteed to make you have to pee.