In the 1990s, scientists declared that schizophrenia and other psychiatric illnesses were pure brain disorders that would eventually yield to drugs. Now they are recognizing that social factors are among the causes, and must be part of the cure.

The great 19th-century observer of America’s democratic revolution has much to teach the tumultuous new century.

A new and better approach to shaping the places in which we live has emerged just as Americans responding to the rising cost of energy begin to crowd into older suburbs and cities.

Liberals and conservatives alike wrap groupthink in the cloak of science whenever convenient. The results are seldom good.

Friendships that were once maintained with the rudimentary technology of pen and paper are now reinforced 24/7 with the stroke of a few keys. A longtime letter writer reflects on what has been gained... and lost.

Today we worry about the social effects of the Internet. A century ago, it was the telephone that threatened to reinvent society.

Solitary confinement, once regarded as a humane method of rehabilitation, unravels the mind. Yet today, more than 25,000 U.S. prisoners languish in isolated cells.

Many nations have aging populations, but none can quite match Japan. Its experience holds lessons for other countries as well as insights into the distinctiveness of Japanese society.

The Port Huron Statement launched America’s New Left in 1962. Today it seems naive and in some ways misguided—yet it raised questions that still agitate Americans today.

The Internet has changed many things, but not the insular habits of mind that keep the world from becoming truly connected.