This self-balancing wheel can make your commute a lot more fun. | Mashable

Three Minute Mechanical Timer: powered by gravity the potential energy of the descending weighted mechanism is transferred to the kinetic energy of the drive train gears and balance wheel pendulum (and associated balance spring). This “mechanical hourglass” has some key features of any mechanical clock, most important for the regulation of movement is the escapement mechanism- the component with two prongs that only allows the escapement wheel to move forward one tooth per swing cycle of the bal