Wellness influencers tout the therapy's power for everything from rejuvenating skin and hair to boosting longevity. Devices sold for at-home use abound. We look at the evidence behind the hype.

Red light therapy has become the latest ray of hope in the wellness industry. On social media, influencers claim it can deliver everything from younger-looking skin to more hair growth, better sleep ...

Scientists experimentally confirmed what we’ve known to be true for half a century—darkness can “travel” faster than light.

(Aitor Diago/Moment/Getty Images) For the first time, physicists have observed that 'holes' in light can move faster than the ...

Researchers have created a nanoscale structure that traps infrared light in a layer just 40 nanometers thick—over 1,000 times ...

Red light therapy has gone from dermatology clinics to the wellness world, promising everything from younger-looking skin and thicker hair to weight loss, pain relief, better sleep, and even improved ...