Population Clock

ClassBrain.com: "Will the World population reach seven billion in your lifetime? How many people are on the planet at this exact moment? Exactly how many of us are there in the United States? The only way to answer these types of questions used to be to visit a museum. With the advent of the Internet we are able to answer the above questions in real time and that’s what we like best... instant gratification!"

The third one down (from UC Berkeley) lets you put in a date in the future and see a population estimate. As of today: 6.4 Billion. I typed in 8/4/50: 8.7 Billion. I'm not sure anyone can conceive of what this all means....