Erwin Schrödinger's 1944 lecture series "What Is Life?" continues to shape how scientists think about biology nearly eighty years after publication. The quantum physicist turned his attention to the physical basis of heredity and organization in living systems, reaching conclusions that anticipated major discoveries decades before they occurred.

Schrödinger proposed that hereditary information resides in an "aperiodic crystal" with enough complexity to encode biological instructions. He suggested this molecule must be extraordinarily stable yet capable of rare mutations. When Watson and Crick discovered DNA's structure in 1953, they found exactly what Schrödinger had theorized: a polymeric molecule with periodic backbone but varying sequences in its bases, allowing for both stability and variation.

The physicist also grappled with life's apparent defiance of thermodynamics, arguing that organisms maintain order by consuming "negative entropy" from their surroundings. This framework remains central to understanding metabolism and energy flow through biological systems.

What makes "What Is Life?" prescient is Schrödinger's approach. He identified the core questions biology needed to answer before the molecular tools existed to pursue them. His book directly inspired physicists to enter biology, including Francis Crick, co-discoverer of DNA's structure. This migration of disciplinary expertise accelerated the molecular biology revolution.

However, the book shows its age in places. Schrödinger worked with incomplete information about chemistry and genetics. His speculations about consciousness and the role of quantum mechanics in biology proved less prophetic than his molecular insights. Modern systems biology has revealed layers of complexity in gene regulation and protein interactions that Schrödinger could not have imagined.

Today's biologists still cite the work not for specific answers but for its foundational thinking about how physical laws govern life. The book exemplifies how rigorous thinking from first principles can pose the right questions, even