Question: Some mice have a wheel in the middle. generally what is this wheel for?

context: In the 21st century, scroll wheels patterned after the mouse's started appearing on keyboards as well, particularly on Logitech and Microsoft models. It was usually located to the left of the caps lock key. The implementation of scroll wheels on laptop computers has generally faded, while touchpads are often programmed with a pointing device gesture to substitute for them; such as allowing the edges to scroll the page (rather than to move the pointer), partly making up for the lack of a scroll wheel; touchpads with multitouch capability usually achieve scroll capability by touching and dragging two fingers on the touchpad at the same time; many Linux distributions offer a third method of scrolling using the touchpad, where the user will first activate scroll-mode by pressing in a corner of the pad, and then dragging in a circle around the center of the pad, letting go of the touchpad will switch back to the default mouse-mode.
question: Some computer mice have a wheel in the middle. Generally, what is this used for?
short_answers: scrolling
context: No context provided
question: Some mouse cages have a wheel in the middle. Generally, what is this used for?
short_answers: running
exercise

Answer: There are several reasons why a mouse has a wheel in the middle. This could refer to a computer mouse, which has a scroll wheel used for scrolling. It is usually located between the left and right mouse buttons and is positioned perpendicular to the mouse surface. This could also refer to a wheel in a mouse cage, or a hamster wheel or running wheel which are exercise devices used primarily by hamsters and other rodents.