They also would provide a vehicle with four wheels in which astronauts could ride.

VOA: special.2009.07.29

One piece of equipment on Apollo Fourteen was a light-weight vehicle with two wheels.

VOA: special.2009.07.29

The first computer mouse was a carved block of wood with two metal wheels.

VOA: special.2010.08.01

Another group lived in what the researchers call an enriched environment up to 20 mice per cage,with toys, hiding places,and running wheels.

VOA: standard.2010.07.14