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The Slammer hit on Super Bowl Sunday. Nimda struck one week after 9/11. Code Red had ripped through the system that summer. Moonlight Maze moved from the Russian Academy of Science and into the U.S. Department of Defense. A new form of warfare has broken out and the battleground is cyberspace.

More than three decades after the Clean Water Act, two iconic waterways—the great coastal estuaries of Puget Sound and the Chesapeake Bay—are in perilous condition. With polluted runoff still flowing in from industry, agriculture and massive suburban development, scientists fear contamination to the food chain and drinking water for millions of people.

Within a single generation, the Web and digital media have remade nearly every aspect of modern culture, transforming the way we work, learn and socialize in ways that we are only beginning to understand.

Teenagers today have more money and independence than ever before. Their lives have become the object of obsessive focus by corporate America. Their tastes, attitudes, and aspirations are sampled and resampled by marketers wielding the latest scientific tools to determine exactly who they are and what they want.

FRONTLINE takes an in-depth look at the multibillion-dollar "persuasion industries" of advertising and public relations. To cut through mass-media clutter and to overcome consumers' growing resistance to their pitches, marketers have developed new ways of integrating their messages deeper into the fabric of our lives.

The National Football League, a multibillion-dollar commercial juggernaut, presides over America's indisputable national pastime. But the NFL is under assault as thousands of former players claim the league has covered up football's connection to long-term brain injuries.