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New neurons are produced in the hippocampus, the part of the brain responsible for learning.

In which case, he says, half-jokingly, that possible organoid overlords would be easier to defeat because "there is always bleach" to pour over the fragile neurons.

Humans have close to 100 billion neurons in their brain, but octopuses have 500 million neurons spread across their entire bodies, including in their eight tentacles that they use to taste the world around them.

These neurons produce cognition by the patterns in which groups of them fire at once — a model that has inspired advanced computers and AI.

Complex or abstract ideas emerge as a result of the firing of many of these nerve cells, or neurons.