This work is continued refinement of increasingly complex and useful nanodevices.
Light powered engine added the 4 nanometer long Rice University nanocar The car’s light-powered motor is attached mid-chassis. When struck by light, it rotates in one direction, pushing the car along like a paddlewheel. There is other coverage at cnet
The nanocar consists of a rigid chassis and four alkyne axles that spin freely and swivel independently of one another. The four buckyball wheels that were used in the original version of the nanocar drained energy from the motor and were replaced with spherical molecules of carbon, hydrogen and boron called p-carborane. Rice University has more pictures and diagrams