Philosophical Society, 1982, pp. 391-392. 2 Putting the singular nature of these developments in context, one electrochemist noted that it had taken two centuries to achieve a fivefold increase in the energy density of all batteries but only a quarter century to double lithium-ion power; see J.-M. Tarascon, "The li-ion battery: 25 years of exciting and enriching experiences, " Interface, vol. 25, no. 3, pp. 79-83, 2016. This month's article tracks the progress of power source technoscience through the last quarter of the twentieth century and beyond by highlighting how the revolution in materials science helped beget the revolution in power sources technoscience.3 D. C. Brock and C. Lécuyer, "Digital foundations: The making of silicon gate manufacturing technology,"