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People with heart disease should keep their weight down, but it can be hard to lose weight and keep it off. Now a study shows big fluctuations may increase the risk of heart attack and stroke.

This low-income elementary school will send dozens of kids to the SuperNationals of chess this week in Nashville, Tenn.

It's a rare victory for environmentalists so far under President Trump. The Senate rejection to rolling back an Obama-era regulation was close — tipping after three Republican senators voted no.

The lawsuit had been dismissed last August because of a change in state law. But an appeals court says the couple can still seek damages from the Kentucky clerk who denied them a marriage license.

Tony Kim, an accounting instructor in his 50s, was detained at Pyongyang's airport in April. At least two other Americans are known to be held in North Korea, sentenced to prison and hard labor.

They're kids' new best friend and some teachers' worst nightmare. And despite being marketed to help ease anxiety and ADHD, one expert says there's no research to support that claim.

Google is making a push into virtual reality with a headset that doesn't require a user to connect to a phone or computer. Amidst massive hype, virtual reality has been slow to take off.

The three physicians "found the molecular switch that regulates how our cells adapt when oxygen levels drop," a member of the Nobel Committee said.

House Speaker Nancy Pelosi, D-Calif., says the House will vote this week on a resolution outlining the process for the next steps in the inquiry into President Trump.

CEO Jack Dorsey announced that Twitter will stop running political ads, citing online ads' "significant risks to politics." Facebook has been criticized for allowing deceptive political ads.