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https://headbraininjury.wordpress.com/2014/03/03/compare-it-you/
Compare it (your head) to a jelly in a bowl. The bowl is the skull - a strong, protective container - and the jelly (the brain) is nestled within. The skull is able to withstand many types of blows; but the brain is vulnerable to sudden swirling or rotating movements. Shake the bowl and see what happens to the jelly."