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This particular kind of jellyfish may not have a brain, but that doesn’t stop it from learning.
https://nautil.us/how-to-learn-without-a-brain-397877/
@estherschindler Sort of like how information can be written down on a piece of paper without the paper having a brain, and a machine without a brain can read what is on that paper and execute instructions.
There's more ways for living things to store information than via central nervous systems.