The U.S. POPclock at the census Bureau keeps a running estimate of the total U.S. Population. Taking the 2000 census as a starting point point, the clock assumes thefollowing standards as of August 31st 2001: -One birth every 8 seconds -One death every 14 seconds -A Net gain of one international migrant every 34 seconds -A Net gain of one U.S. citizen returning every 3,202 seconds. That results in an overall Net gain of one person every 11 seconds. http://www.census.gov/ipc/www/clock2.html A similar formula was used to determine the world population, but since there's about 500variables that determines it im not gonna type them out because im a lazy bastard. But watching this clock while stoned gets under my skin in a way...Especially the world population...Talk about running out of room really fuckin fast!