Wow. When I was back in grade school, the population statistics I remember were that the US population was 250 million, and the world population was 4 billion. Big numbers, and I thought, if I could just get everyone to send me a dollar... Ah, the dreams of youth. A quick trip to the population clocks at the [US and World Population Clock](http://www.census.gov/popclock){:target="popclock"} website took me by surprise. The US population has just recently climbed over 300 million and the world population is up to over 6.5 billion. Simply amazing. 20% and 60% growth respectively. I suppose that it's good to keep track of this stuff, if just for the sake of scale. There really are quite a lot of people out there.