The latest such chips can fit roughly 15 million transistors into a dot the size of a single full stop on this page. The transistors in today’s smartphones are not just smaller than a red blood cell (about a thousand times smaller, as it happens); they are smaller than the COVID-19 virus. Actually you could fit four of them inside a coronavirus, each transistor having about the same dimensions as one of the virus’s spike proteins, those club-like tendrils radiating out from its centre.
