Scientists find ancient fossilized brains: “This brain organization closely resembles that seen in extant insect species, suggesting that the brains of certain arthropod species, such as the brine shrimp, regressed to less complex nervous systems as they evolved. The human brain is also partitioned into segments, most prominently during embryonic development, but also throughout life, and so it seems the basic ground plan for all nervous systems was laid down more than half a billion years ago, and has remained unchanged ever since.”