Willem Pennings hat einen Würfel dazu gebracht, auf einer seiner Ecken zu balancieren. Nicht mehr, nicht weniger.
This cube balances itself on one of its corners or an edge using three reaction wheels mounted inside the cube. A microcontroller takes readings from an inertial measurement unit and converts them to control signals for three brushless DC motors which drive the reaction wheels.
(Direktlink, via Book of Joe)
