Here’s how it works. The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant ...

Barring a freak power outage, the light emanating from towns and cities due to unnatural light sources is so bright that it washes out the stars. Today one-third of all humans, including 80% of ...

If you’ve stumbled into red light therapy videos on social media, you’ve probably heard that it clears acne, reduces wrinkles, reduces inflammation, and heals joints. You may have also heard ...

Full-face LED masks like this one can cost up to several thousand U.S. dollars. The application of red light can stimulate collagen production and blood circulation, and even reduce signs of aging.

We’ve all read the reports: Blue light can play a role in sleep issues. It’s also been mentioned as a factor in skin damage, too. Fortunately, not only can you enable a blue-light filter on ...

Blue light -- the kind from your smartphone, tablet, TV, and even energy-efficient light bulbs -- is not necessarily damaging to the eyes but can trigger eyestrain and lead to a range of health ...

Previously, at Protocol, The Wall Street Journal, and Wired. Now, Light is trying to do something a bit different. The company is launching the Light Phone 3, which comes with a new display ...