The slime mold Physarum polycephalum has no brain, no neurons, and no obvious right to be called clever. It is a single cell, though a strange one, sometimes spreading across a square foot of forest floor as a fan of yellow veins. And yet, in a now-famous experiment, researchers placed oat flakes at the exits of a maze and watched the organism 'solve' it—withdrawing from dead ends and thickening the tubes along the shortest route to food. To call this solving is to reach for a word built for minds, and the reaching is deliberate. Biologists use such language cautiously, aware that it flatters the organism and flatters us for noticing. Physarum does not decide anything in the way we mean the word. It follows chemical gradients, reinforcing productive channels and letting useless ones wither, and the maze's solution emerges from that blind bookkeeping. Still, the metaphor earns its keep. It reminds us that behavior we associate with intelligence—memory, anticipation, efficient design—can arise without a nervous system to house it. The slime mold does not think. But it does something that, from the outside, is difficult to distinguish from thinking, and that resemblance is itself a fact worth explaining rather than explaining away.