There's a standard set of black and white keys on a traditional piano, but some may have less depending on size. Here's the reason behind the number.

Whether black-and-white or white-and-black, separating the whole and half tones into repeating patterns of 12 notes makes it much easier for a pianist to play and to find the right notes on the full ...

Apple's black Mac mouse, for example, retails for $99, higher than the $79 of the white variant. The Black Magic Trackpad costs $149 , and the Black Magic Keyboard retails for $199 . Going hands on ...