Jack Gernsheimer met my car at the bottom of the lane. He looked good this summery Sunday, rested and tan. The logo on his T-shirt was one he and his brother designed years ago, featuring…

For Ryan Sherman*, a 34-year-old lawyer, something changed eight years ago when he moved from Texas to Europe and then to Boston and New York City: The shorter winter days of the more…

The squeak in my mom’s voice seemed strange, but not worrisome. When we spoke on the phone, she sounded like she had inhaled helium. An initial doctor’s evaluation revealed nothing.…

Next month, during the Islamic pilgrimage known as the Hajj, 3 million people will pour into the holy city of Mecca in Saudi Arabia. They will worship, pray, and be within 50 miles…

In 2007, Patrick Savage, then a 52-year-old deputy chief of the New York City Fire Department, suffered cardiac arrest after a morning run on the treadmill. He had run triathlons every…

On Sept. 13, 2005, Nick Yee died. A few moments later, he came back to life. Then he died again. And he wasn’t the only one. His city was littered with bodies, bones scattered across…

Walter A. Brown envisions it clearly. The day will come when a woman can walk into his office complaining of debilitating panic attacks and depression, and he will draw a vial of blood…

In 1962, physicist and historian Thomas Kuhn proposed that science makes progress not just through the gradual accumulation and analysis of knowledge, but also through periodic revolutions…

Her mum frowns on it. Cancer experts once all warned against it. But these days you’ll find Vandana Verma, a 29-year-old secretary in Melbourne, Australia, sitting outside at lunch…

Twenty years ago, Bill Jacobs made the tuberculosis bug glow. It was like mounting a pair of headlights on a man-eating tiger. One of the world’s deadliest infectious diseases could…