I'm going to be sloppy with population stats, rounding off as I see fit and not worrying about whether stats are from 1990 or 2000...
world popul: 6B (http://www.nat.org/population/)
US pop: 285M
NYC pop: 7.3M in 1990 (2.1M foreign-born); 20.2M metro area
China pop: 1.2B
Mexico city population (metro area): 17M; 9.8M in city itself
Japan pop: 125M
Tokyo pop: 7.8M city, 11.7M metro
US students: 49M K-12.
NYC students: 1 million (80k teachers) (public schools only?)
I like a nice historical Macro Timeline, also
Some big human entertainment-group sizes:
American Idol had 43M viewers for its final half-hour
network-TV nightly-news: 27M total nightly viewers (that doesn't count CNN, FoxNews, local, cable, etc.)
- do those really pull 10x that?
circulation of the Ny Times (in print): 1.1M
Google: 66M monthly visitors
MySpace members: 60M (mid-2006); 50M visitors in May'2006
FlickR: 5M visitors May'2006
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