PASADENA, California, Oct. 1 -- The California Institute of Technology posted the following news: * * * Heat-Rechargeable Design Powers Nanoscale Molecular Machines * Though it might seem like science fiction, scientists are working to build nanoscale molecular machines that can be designed for myriad applications, such as "smart" medicines and materials. But like all machines, these tiny devices need a source of power, the way electronic appliances use electricity or living cells use ATP (a  more