7 Billion. For Realz.

This video reminds me of the time I was 9 and our family sat around the dinner table one night talking about how big a million and a billion are. Dad had come up with some awe-inspiring amount of time that it would take 1 million people to walk in front of our mailbox, one right after the other. I can't remember it now but I remember the feeling I had trying to comprehend that then. It's the same feeling I had just now trying to comprehend 7 billion people here.