Every physician recognizes the serpent and the staff. It appears on hospital logos, medical schools, and ambulance doors, so familiar that few of us stop to ask what it actually means.

Many assume the symbol of medicine is the caduceus: two snakes, wings, and a staff. It is not. That emblem belonged to Hermes, the Greek god of commerce, negotiation, and speed. Its twin serpents represent exchange and trade, apt for …

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For the past century, physicians have practiced within the framework of materialism: the belief that everything real can be measured, and everything measurable is real. But that worldview has been quietly eroded by physics itself. In the double-slit experiment, particles behave as waves of probability until observed, at which point they collapse into definite form. Later variations (such as Wheeler’s delayed-choice experiments) demonstrated that observation seems to determine not only …

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