This month marks one of Hinduism’s most celebrated festivals. Diwali, the annual festival of lights, begins on Oct. 20.

Diwali, the Hindu Festival of Lights, kicked off on Saturday but is celebrated Monday, Oct. 20, this year. Here are some of ...

Light is faster than anything else in the known universe, though its speed can change depending on what it's passing through. When you purchase through links on our site, we may earn an affiliate ...

Diwali is one of the most celebrated holidays in India and has become increasingly significant in the Indian-American ...

Humans have discovered powerful telescopes to gaze at the beautiful night sky, only to realize that distant objects in space are things of the past. The light of these distant objects takes a certain ...

Blue light is good for your body during the day, but exposure to blue light at night can cause mild to more severe health effects.

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? At the simplest level, different colors of light have different wavelengths.

Diwali or Deepavali celebrates the "victory of good over evil during the course of five days," according to the Hindu American Foundation.

The biggest public holiday in India, Diwali features prayers for prosperity and good fortune — and lots of sweets.