Inspired by reports of a second patient apparently freed of infection with H.I.V., the virus that causes AIDS, scientists are pursuing dozens of ways to cure the disease. But now, researchers must reckon with a longstanding obstacle: the lack of…

PASADENA, Calif. — The engineer’s mantra, said Frances Arnold, a professor of chemical engineering at the California Institute of Technology, is: “Keep it simple, stupid.” But Dr. Arnold, who last year became just the fifth woman in history to win…

Image The American medical malpractice system is doing almost nothing to improve the quality of health care, research suggests. What may be more concerning is that there is very little discussion, much less action, about changing this. Despite worries among…

Although the woman in her 50s had been effectively treated for depression, she remained plagued by symptoms that often accompany it: fatigue, sleepiness and lethargy, even though she thought she was getting enough sleep. With depression no longer causing her…

LOUISVILLE, Ky. — Alex Carll was presenting his research about the impact of e-cigarette smoke on mouse hearts at an American Heart Association conference when a man from Juul Labs approached him and started asking questions. “He seemed genuinely concerned…

Did the people who brought you baby powder and baby shampoo also bring you the opioid crisis? That will be the question before an Oklahoma judge starting Tuesday, as the first civil trial takes off on the long, nationwide runway…

Welcome to the Running newsletter! Every Saturday morning, we email runners with news, advice and some motivation to help you get up and running. Sign up here to get it in your inbox. On Tuesday, I ran my first race…

The Food and Drug Administration on Friday approved a gene therapy for spinal muscular atrophy, a rare muscle-wasting disease that, in its most severe form, kills many babies before they turn 2. The price will be $2.1 million, believed to…

How do I care for my pubic hair without giving myself a yeast infection? Is there anything I can do besides washing in the shower? I’ve noticed there are now oils and creams on the market, but I am wary…

­PHILADELPHIA — She called it her “deepest, darkest secret,” one she had never even shared with her husband. When Saffiatu Sillah was growing up in the West African nation of Sierra Leone, her clitoris was cut off in a ritual…