Facing down a heat wave this summer? There's a new beta app for iPhones from the founder of Twitter, Jack Dorsey, that helps you track your exposure to the sun. The Sun Day app is free to testers and ...

For years, medical advice on sun exposure has remained largely consistent: limit direct sunlight, apply sunscreen liberally, and wear protective clothing to minimize the risk of skin cancer. But as ...

Then, in 2023, a consortium of Australian public-health groups did something surprising: It issued new advice that takes careful account, for the first time, of the sun’s positive contributions. The ...

You’ve been doing everything right. You’re spending time outdoors, soaking up those precious rays, maybe even ditching the sunscreen for a few minutes to let your skin do its vitamin D magic. But then ...