some mice have a wheel in the middle. generally what is this wheel for
scrolling
title: Hamster wheel text: Hamster wheel Hamster wheels or running wheel are exercise devices used primarily by hamsters and other rodents, but also by other cursorial animals when given the opportunity. Most of these devices consist of a runged or ridged wheel held on a stand by a single or pair of stub axles. Hamster wheels allow rodents to run even when their space is confined. The earliest dated use of the term "hamster wheel", located by the Oxford English Dictionary, is in a 1949 newspaper advertisement. Most wheels are constructed of steel or plastic, both of which have advantages and disadvantages. Solid plastic title: Scroll wheel text: Scroll wheel A scroll wheel (or mouse wheel) is a hard plastic or rubbery disc (the "wheel") on a computer mouse that is perpendicular to the mouse surface. It is normally located between the left and right mouse buttons. It is used, as the name suggests, for scrolling. It can often also be used as a third mouse button by pressing on it. The wheel is oftenbut not alwaysengineered with detents to turn in discrete steps, rather than continuously as an analog axis, to allow the operator to more easily intuit how far they are scrolling. Some modern mice can title: Scroll wheel text: orbit. Scroll wheel A scroll wheel (or mouse wheel) is a hard plastic or rubbery disc (the "wheel") on a computer mouse that is perpendicular to the mouse surface. It is normally located between the left and right mouse buttons. It is used, as the name suggests, for scrolling. It can often also be used as a third mouse button by pressing on it. The wheel is oftenbut not alwaysengineered with detents to turn in discrete steps, rather than continuously as an analog axis, to allow the operator to more easily intuit how far they are scrolling. Some modern mice title: Hamster wheel text: the deer mouse ("Peromyscus maniculatus") can develop preferences for wheels that force the animals to jump, such as square wheels or wheels with hurdles along the running surface. Like other rodents, hamsters are highly motivated to run in wheels; it is not uncommon to record distances of being run in one night. Other 24-h records include for rats, for wild mice, for lemmings, for laboratory mice, and for gerbils. Hypotheses to explain such high levels of running in wheels include a need for activity, substitute for exploration, and stereotypic behaviour. However, free wild mice will run on wheels installed in title: Mice problem text: Mice problem In mathematics, the mice problem is a problem in which a number of mice (or insects, dogs, missiles, etc.) are placed at the corners of a regular polygon. Each mouse begins to move towards its immediate neighbour (clockwise or anticlockwise). It must be determined when the mice meet. The most common version has the mice starting at the corners of a unit square, moving at unit speed. In this case they meet after a time of one unit, because the distance between two neighboring mice always decreases at a speed of one unit. More generally, for a regular