11.  American cities are young and are usually looking for an identity.

12.  American cities form in a blink, and that is particularly true in the West.

13.  American cities like New Orleans, Nashville, San Diego and Baltimore have for years been switching to district cooling as a cheaper alternative to single-building systems.

14.  Ambitious cultural planners for American cities are advised to put delusions of civic grandeur aside, come down to Raleigh and have a look.

15.  American cities are frightening, even if the crime rate is falling.

16.  American cities are still where people of different bents and pursuits come together and where new ideas are born.

17.  An incumbent black mayor of a major black-majority American city has never been upset by a white opponent.

18.  An alien in black clothes and sunglasses stalks an American city.

19.  And he is part of a strong wind of change that is beginning to blow through American cities.

20.  And for American cities, a record low and high temperature for each day and the year that record was achieved is given.