That was at least a relatively short lived belief. That glia, the other half of brain cells, got ignored and relegated to “support” for so long is, to my mind, the worse mistake: https://www.quantamagazine.org/these-cells-spark-electricity...

That said, science wouldn’t need to be self-correcting if it was always right.

Science is like a group of people with lights of varying strength exploring a dense forest at night. We often mix up shadows and caves and rocks and animals and people… there’s a lot of room for misinterpretation. To demand otherwise, to demand some kind of mistake free march in good order as if we’re on a brightly lit field, is to ignore that we are… ingnorant.