The physicist Richard Feynman gave a prophetic lecture more than 40 years ago in which he predicted much of the miniaturization that would occur in the ensuing years. To date, miniaturization has been demonstrated in many fields, such as electronics, information storage, and micro-electro-mechanical systems (MEMS) in the range of scales that Feynman paradoxically described in his lecture “Plenty of Room at the Bottom.” Perhaps deliberately, he did not mention power generation. The power generating component is often the factor determining the size and weight of a number of portable consumer electronics (for example, mobile phones) and hampering further miniaturization.