Our brain shape science basically boils down to:

• missing big pieces usually makes it work less well.
• folds and creases seem good?
• Not too much fluid!
• Not too little either!
• front part seems pretty important for thinking.
• middle too.
• “stuff” in the brain is almost always bad for thinking. Like rocks and things. Neurons, blood and the right blend of fluids are great.
• phrenology is pretty wrong. Like, super wrong.

Beyond that, we know a bunch of stuff about brains and neurons and how they all piece together, but just based on lookin’, we’re pretty bad at judging a person based on their head and brain.