Add Yahoo as a preferred source to see more of our stories on Google. Purple light from a small UV flashlight - Vlad Kazhan/Shutterstock What if we could turn off the lights, flip on a flashlight, and ...

Your iPhone and Samsung phone flashlights have hidden controls for brightness, beam width and voice commands that most people ...

Growing up, my dad always made sure we had a flashlight at home. “You’ll need this in case an emergency happens,” he’d say. And with an extra level of caution ...

What if we could turn off the lights, flip on a flashlight, and watch the world transform in a dim purple glow? If you're a fan of forensic crime dramas, or you've used ultraviolet tools at work to ...