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Los Angeles is among a growing number of cities across the U.S., including San Francisco and New York City, requiring people show proof of vaccination to enter various types of businesses and venues.

The annual survey finds Americans more on edge than ever, triggered by financial issues, the war overseas and the cumulative pressure of living through the pandemic.

The U.S. Supreme Court ruling in the Hamdan case challenges a key part of the Bush administration's policy toward terrorism suspects. A main architect of the policy is Vice President Cheney's chief of staff, David Addington -- subject of a recent New Yorker profile by Jane Mayer. She talks with Alex Chadwick about Addington's career and influence.

In the Democratic Republic of Congo, the army is trying to wipe out a group of renegade militiamen. In the 1990s, the Mai Mai were autonomous local defense forces but they've since mutated into small rogue armies. The government says the Mai Mai are terrorizing people in the southeast region of the country.

A measles outbreak in Boston is showing how the global economy opens opportunities for one of the world's most contagious viruses. Disease detectives say a computer programmer from India brought the virus to Boston's tallest office tower. The outbreak reveals that millions of Americans in their 30s and 40s are vulnerable to measles, even though they were vaccinated years ago.

Lance Armstrong's competitive cycling career ends Sunday on the streets of Paris with a seventh straight Tour de France victory. The American racing legend says he will retire at age 33.

This blood test detected signs of cancer in 70 percent of people with eight common forms of the disease. But it was much less good at identifying cancer in people in the early stages.

The federally subsidized program for uninsured people with health problems is one of the first changes to go into effect from the health care overhaul law passed this year, but enrollment in the plans springing up around the country is below expectations. It's too soon to gauge the program's impact, but some officials are still surprised.

Only about 300 to 400 people a year give a kidney to someone they never met. It's an act of generosity so unusual, a neuroscientist studies the people who do this.

Emerging science shows that people respond more favorably to warnings about climate change when it's portrayed as a health issue rather than as an environmental problem. Should the symbol for danger be a child instead of a polar bear?