This exhibit demonstrates the non-intuitive forces and motions one experiences when dealing with gyroscopes. This gyroscope, unlike most others, allows the addition or subtraction of angular momentum because of its two wheels. When the wheels are spun in the same direction, their combined motion add, when spun oppositely, they can cancel if spun to the same speed. To demonstrate precession, a sliding weight provides an adjustable but constant force for experimentation. The exhibit is mounted on a table which in turn is mounted on a set of good casters. When the gyroscope is spun up and the sliding weight set for no precession (in the middle), the exhibit can be moved aroung the museum floor and it will not change its spatial orientation (much).