Purdue Pharma ran an unprecedented, aggressive and multi-faceted marketing campaign from 1996 to the early 2000s that helped kickstart the nation’s current opioid crisis.

Fentanyl was created to treat severe pain — particularly for cancer patients — and for use as an anesthesia. Then dealers started cutting it with heroin.

"Knowledgeable experts within the University have questioned the methodology and accuracy of the report,” President Philip B. Oldham wrote to Environmental Protection Agency chief Scott Pruitt and Tennessee Rep. Diane Black.

Victor Buso, a locksmith in Argentina, photographed a supernova at the earliest stage ever seen, which has revealed clues about how stars explode.

The couple said they were told by a federally funded charity that parents must “mirror the holy family.”

The agency recommends that people not consume the botanical in any form because it could be contaminated.

Photos of Mars, the super blue blood moon, galaxy cluster Abell 1758 and more images from space.

In a rare discovery, scientists caught the deep-sea octopus in the act of hatching.

The Trump administration says its latest move would give consumers an affordable alternative to the law’s marketplaces.

Corden's recent Grammy Awards gimmick actually had a scientific underpinning, which explains a lot about human behavior.

  • Abigail Marsh
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Hospitals team up with lending institutions to make sure their bills get paid. Critics urge consumers to be cautious.

  • Shefali Luthra, Kaiser Health News
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Many nations aren’t living up to their promises in the 2015 accord, and the consequences could be “catastrophic.”

Researchers find more risky drinking among teens given alcohol by parents.

  • Lisa Rapaport
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Adaptations to climate change helped give the Dutch a golden age.

  • Dagomar Degroot
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Then a physical therapist recalled an odd condition that afflicts concert pianists.

  • Perspective

But sometimes not knowing what lies down the road can also mean there’s hope

Take a tour of chemist Lawrence Principe’s lab at Johns Hopkins University.

It was the sickest he’d ever been, and perhaps getting a vaccine saved him.

  • Robyn Correll
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Giraffes can’t afford to sleep for long, Smithsonian Earth series says.

  • Erin Blakemore
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Research has found it can increase the risk of depression and possibly even dementia.

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Christine Sylvest, who now works in Maryland, for three years attended the Parkland, Fla., high school where a shooting attack left 17 people dead last week. She says the tragedy affects the entire community.

  • Phil Galewitz, Kaiser Health News
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Hospitals increasingly team up with lending institutions to offer low- or no-interest loans to patients to make sure their bills get paid. But critics say the complexity of hospital pricing means consumers should be cautious.

  • Shefali Luthra, Kaiser Health News
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The policy change is expected to entice younger and healthier people from the general insurance pool by allowing a range of lower-cost options that don’t include all the benefits required by the federal health law.

  • Julie Appleby, Kaiser Health News
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A multistate nursing agreement allows nurses to work in numerous states without the hassle and expense of obtaining licenses in each one. More than half of states have signed onto an upgraded version of the agreement — but not California.

  • Anna Gorman, Kaiser Health News
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