Brightness is important in everything from phones and computer displays to TV screens and video boards. Bring your laptop or phone outdoors and you will realize that the display is nothing but shadows ...

Your MacBook does not know better than you. Apple's macOS has an infuriating habit of automatically changing the computer's screen brightness level, seemingly at random. No, it's not all in your head.

Add Yahoo as a preferred source to see more of our stories on Google. Press Win+A to find the brightness slider, or look for the sun keys on the keyboard Alternatively, use the screen brightness keys ...