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Sen. Barbara Boxer of California announced that she won't seek re-election. State Attorney General Kamala Harris has said she'll run for the seat, but a number of Democrats are considering a run, too.

New dietary advice is on its way. A panel of top experts — appointed by the federal government — is expected to update recommendations on what we should be eating. And one thing on the mind of the panel is dietary cholesterol. Americans have been told for decades to limit cholesterol-rich foods, but advice may be changing.

Wal-Mart, the nation's biggest company, affects the lives of millions of workers and shoppers. So its U.S. leadership change is attracting lots of interest. Here are some theories about what happened.

A new report looks at the top causes of death in 188 countries. Infectious diseases are less of a threat than in 1990 — but please, look both ways before you cross the street.

As two climbers attempt Yosemite's most daunting cliff face, documentarian Nick Rosen, co-writer and co-director of Valley Uprising, explains the park's history of climbs and culture clashes.

From tasty tempura to gross gruel, hospital meals across the globe vary wildly. Highbrow institutions in China and India have long served top-notch food. U.S. hospitals are starting to follow suit.

A British Army private died of dysentery 99 years ago. A sample of the bug that killed him may help researchers develop a vaccine for this antibiotic-resistant disease, a top killer of young kids.

America's top diplomat says North Korea's muscle flexing on the Korean peninsula may lead to further international sanctions — and possibly a referral to the International Criminal Court.

This week, Google started prioritizing mobile-friendly websites in Google searches made on a smartphone. The change could hurt businesses whose sites don't pass Google's mobile-ready test.

Panama's economy, while cooling in recent years, is still growing at astonishing rates compared to its neighbors. But environmental damage and huge government debt are part of the package.