"The brain is suspended in a kind of thick jelly inside the skull, and a helmet can't keep it from sloshing around. If you hit your head hard enough, the brain goes bashing against the walls of the skull."
Thick
"The brain is suspended in a kind of thick jelly inside the skull, and a helmet can't keep it from sloshing around. If you hit your head hard enough, the brain goes bashing against the walls of the skull."