As might be expected, Sacramento's expansion is driven by the housing demands of the well-to-do.

ECONOMIST: Urban sprawl

As China is the world's largest producer, it might be expected to pick up, say, half of that.

BBC: EU's aviation charge is a drop for China's airlines

As might be expected, diners leave larger tips when the restaurant is elegant or in an urban area, when the food quality is high, and when the weather is pleasant.

FORBES: Tips for Influencing the Size of Tips

As a result, the 21st Century is turning out to be more people-centered than one might have expected.

FORBES: Gasp! Machines Still Can't Think!