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.

Nowadays there is more attention on what you do after the gym, rather than in it. The recovery market is massive, with ...

A light-sensitive crystal is opening the door to a new era of “light-written” technology. Arsenic trisulfide can be reshaped ...

Albert Einstein famously discovered that nothing with mass, not even supersonic sound, is faster than the speed of light. For over a century we have operated with this belief. But, in reality, we’ve ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Light-based technologies have wide practical applications. Wikimedia Commons, CC BY Light is all around us, essential for one of ...