There isn’t much to Caenorhabditis elegans. At about 1 mm in length, it’s the smallest of the roundworms. C elegans mostly consists of a primitive digestive tract and some clear gunk. It has a brain, but it’s just about the minimum possible arrangement of neurons that could be considered as such. That’s 302, while humans pack something like 86 billion neurons. Still, it’s the only organism whose whole brain (or connectome) has been completely mapped.

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