Physarum polycephalum

The ultimate guide to slime mold

In 2000, a brainless single-celled organism redesigned the Tokyo subway network more efficiently than human engineers. No neurons, no eyes, no nervous system. Welcome to the world of slime mold.

4 cm/h Top speed
720+ Mating types
Potential lifespan
1 billion+ Nuclei per organism
Physarum polycephalum in a Petri dish held in a laboratory
Physarum polycephalum in the lab. The bright yellow vein network is slime mold's visual signature.

Learn about slime mold

From the fundamentals to advanced biology, everything science knows about this extraordinary organism.

Slime mold and modern science

From optimization algorithms to neuromorphic chips, slime mold inspires a new generation of technologies.

Grow your own slime mold

Slime mold is one of the easiest and most fascinating organisms to observe at home. Here's everything you need to know.

Interactive tools

Quizzes, simulator, true or false: test your knowledge and visualize slime mold behavior.

References and vocabulary

Plasmodium, myxomycete, coenocyte... All the scientific terms explained in plain English.

Think you know everything about slime mold?

10 questions to test your knowledge, from casual curiosity to expert-level science.

Take the quiz Growth simulator
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Did you know?

In 2000, Japanese scientists placed slime mold on a map of the Tokyo area, with oat flakes at the locations of major train stations. Within hours, the organism had built a network nearly identical to the actual rail system, considered one of the most efficient in the world.

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It has over 720 mating types

Unlike animals that have only two sexes, slime mold has more than 720. This means it can reproduce with the vast majority of individuals of its species that it encounters in the wild.