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Purple sea urchins are devouring the kelp forest off California's coast. To help the forest survive, researchers are trying to make these urchins a delicacy on menus at seafood restaurants.

Sarah and Andy were in love and also advocates, determined to keep drug users from dying. But when his own addiction reemerged, Andy's fear of returning to prison kept him from the best treatment.

Brown has long considered questions about science and faith, leavened with plenty of adventure, of course. In his new novel, he asks whether faith in God (or gods) can survive the advance of science.

Infectious disease specialists debate whether it's better to give the strongest antibiotics all at once for drug-resistant germs or save the most innovative medicines for use as a last resort.

Male and female athletes compete in separate categories because of advantages that come with testosterone. But what should be the rules for women who have naturally high testosterone levels?

National Institutes of Health research "that requires new acquisition of fetal tissue from elective abortions will not be conducted," the Department of Health and Human Services says.

TV networks have standards that minimize tobacco use on shows, and Netflix now does, too. But streaming companies lack public policies about smoking cannabis onscreen, and doctors say that hurts kids.

Craft's nomination as ambassador to the United Nations follows State Department spokeswoman Heather Nauert's withdrawal from consideration.

There's mounting evidence that the measles virus can erase our immunity to everything from influenza viruses to diarrheal disease.

Author Michael Pollan, who experimented with mushrooms, LSD and other psychedelics while researching his latest book, says: "I had an experience that was by turns frightening and ecstatic and weird."