The Touchstone of Life: Molecular Information, Cell Communication, and the Foundations of Life

Loewenstein, a biophysicist who spent decades studying cell-to-cell communication through gap junctions, argues that information is the fundamental organising principle of life. He traces how cells receive, process, store, and transmit information at every scale — from molecular signalling within a single cell to the coordination of trillions of cells in a multicellular organism. The book bridges Shannon's mathematical theory of information and molecular biology in a way that few authors have attempted, showing how concepts like channel capacity, noise, and error correction apply directly to biological systems. Loewenstein writes with the authority of an experimentalist who has measured these processes and the ambition of a thinker who sees their philosophical implications. The result is one of the most rigorous popular treatments of life as an information-processing phenomenon, predating and informing the current wave of interest in biological computation.