Its an interesting, but ultimately pointless site. I would assume they take various statistics like "1 child is born every 6 seconds" or what have you, and then start counting from there, with some sort of timer running to update all the counts.

It seems like someone decided they wanted to learn... some sort of javascript. They decided to obfuscate large portions of it, but it looks to my rather un-educated guessing to be jQuery. I do have a question though, it has several "today" counts. When does the day start? Is it based off of your computer's time, or off their server's?