It has no brain, no neurons, and technically no organs — just a single giant cell. Yet Physarum polycephalum can navigate mazes, redesign Tokyo's rail network, learn to ignore pain, and pass that memory to another blob by touching it. Biologists are still arguing about what 'thinking' even means.
Journey to the Microcosmos introduces the organism — millions of amoeba-like nuclei fusing into one crawling, pulsing 'body' with no center in charge.
Researchers placed oat flakes where Tokyo's cities are and let the blob grow. In a day it produced a network nearly identical to the real rail system engineers spent decades designing.
Why a brainless organism keeps outperforming planning boards — finding short, efficient, fault-tolerant networks with no map and no forethought.
Audrey Dussutour showed the blob can habituate: after days of crossing a bitter caffeine bridge it stops flinching. Then it transfers that learning to a naive blob by fusing with it.
The World Science Festival weighs the hard question: is any of this 'intelligence,' or is it chemistry that only looks like thought from the outside?
In 2019 a zoo put Physarum on display as a living exhibit — an organism with roughly 720 sexes that can heal itself in two minutes when cut in half.
A philosophical essay on how memory and decision-making might exist without neurons — encoded instead in the rhythmic pulsing of a single cell's own body.
The full biological profile of 'the many-headed slime' — its life cycle, its use as a model organism, and the surprising range of computations scientists have coaxed out of it.