The human brain is not a single organ, but two separate systems that evolved independently before fusing together, according to groundbreaking new research. … Armed with the knowledge of how hindbrain cells uniquely form, the team has successfully turned human stem cells into becoming functional hindbrain motor neurons in a lab for the first time.
I’m more surprised that it’s separated as front and back, and not right to left.
The left/right brain thing has always been bunk. People have entire hemispheres removed with minimal negative consequences, personality changes, etc.