Cities and populations
For some reason I find it interesting to look up populations of cities. Here are some ballpark figures from Wikipedia, so I don't forget.
(city name - population of city / population of area - city population density per km2)
Tokyo JP - 8M / 12M - 5700
New York NY USA - 8M / ? - 10200
London UK - 7M / 14M - ?
Los Angeles CA USA - 4M / 16M - 3000
Hong Kong CN - 7M - 6200
Yokohama JP - 4M / ? - ?
Osaka JP - 3M / 17M - 12000
Chicago IL USA - 3M / 10M - 5000
San Francisco CA USA - 800k / 7M - 6400
Singapore - 5M - 6000
Houston TX USA - 2M / 5M - 1300
Auckland NZ - 1.2M / ? - ?
Christchurch NZ - 360k / ? - ?
See also: wikipedia's list of most densely populated cities.
(city name - population of city / population of area - city population density per km2)
Tokyo JP - 8M / 12M - 5700
New York NY USA - 8M / ? - 10200
London UK - 7M / 14M - ?
Los Angeles CA USA - 4M / 16M - 3000
Hong Kong CN - 7M - 6200
Yokohama JP - 4M / ? - ?
Osaka JP - 3M / 17M - 12000
Chicago IL USA - 3M / 10M - 5000
San Francisco CA USA - 800k / 7M - 6400
Singapore - 5M - 6000
Houston TX USA - 2M / 5M - 1300
Auckland NZ - 1.2M / ? - ?
Christchurch NZ - 360k / ? - ?
See also: wikipedia's list of most densely populated cities.