My journey to a firefly sanctuary in Bali revealed a striking truth: the artificial light destroying the firefly’s glow is the same force disrupting our circadian rhythms, sleep, and long-term health.

In 4 hours, I learned more about my health than I would in years at home.

Coveteur: Plus, meet the first sunscreen filter approved in the U.S. in 25 years.

Bryan Johnson, the “longevity guru,” has spent more than $2 million on a quest to stay young. On June 30, 2026, he disclosed that he has an autoimmune disease that causes the stomach to eat itself. As a practicing physician who helps patients live longer, believe me when I say: you absolutely don’t need extreme measures to live a healthy life. Here’s what actually works.

Exercising outside in high temperatures can be a health hazard. Here’s how to read your local index so you can recreate or work out with limited risk.

For a city that lives outdoors, these hometown makers understand exactly what your complexion is up against