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Oregon Democrat Jeff Merkley has backed Sanders, which could help him in Oregon's May 17 primary. Hillary Clinton has far more endorsements from Congress — a big part of her superdelegate lead.

Researchers are starting to look at the therapeutic possibilities of psychedelic drugs. A sensation that the self is merging with the world could be due to changes in brain connections, a study says.

China and several regional neighbors are locked in a growing dispute over the status of islands throughout the South China Sea. Here's a guide to what's at stake.

Researchers are trying to figure out whether probiotics — the stuff we like to eat in yogurt to keep our guts healthy — could also help pigs, cows and chickens thrive.

In government-held areas, citizens queued up to cast ballots Wednesday. The vote, which coincides with the start of peace talks in Geneva, is expected to usher in an assembly loyal to the president.

In preparation for sea level rise, vulnerable cities are building infrastructure to protect themselves. But as a look at New Orleans and Philadelphia shows, the strategies are unique to each city.

The U.S. has reached out to foes that include Cuba, Iran and Myanmar. Now the State Department weighs in with its annual report on human rights around the globe.

The unemployment rate in Washington state held steady at 5.8 percent for the fourth consecutive month in March. But in its latest jobs report out...

U.S. health officials say they are now convinced that Zika virus can target the developing brain before birth, leading to a severe type of microcephaly and other brain abnormalities.