Episode
Lesson 2: The Persistence Test
- Podcast
- The Functional Mind
- Published
- May 19, 2026
- Duration seconds
- 426
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Summary
Lesson 2: The Persistence Test Prologue Consider two things left in a field for a year. The first is a bicycle. Steel frame, rubber tires, a chain that was recently oiled. The second is a bacterium — a single cell, one ten-thousandth the size of a pinhead, with no moving parts you could see under anything but the most powerful microscope. Come back a year later. The bicycle will be on its way to ruin — the chain seized, the tires cracked, the frame beginning to surrender to rust. The bacterium, if conditions permitted, will have become millions of bacteria. It will have found energy, repaired itself, and made copies. It will, in some meaningful sense, have grown. The atoms in both objects obey exactly the same laws of physics. And yet something has happened to the bacterium that did not happen to the bicycle. Something that physics, on its own, has no language to describe. In this lesson, we find that language. For centuries, science has operated under an unspoken assumption about what it means for something to exist. To exist, in the scientific sense, has meant to be physical — to be composed of matter and energy, subject to forces, measurable by instruments. This is the doctrine of physicalism, and it has served science brilliantly wherever it has been applied to the nonliving world. The problem appears when we ask a deceptively simple question about living things: why do certain configurations of matter persist while others do not? A rock persists. A star persists, for billions of years. These are not puzzling cases — the forces holding them together are well understood. But a bacterium persists in a different and more interesting way. It doesn’t merely hold together; it actively maintains itself. When it is damaged, it repairs. When it runs low on resources, it see…