Why is the human skull as dense as it is? Nowadays we can send a message around the world in one-seventh of a second, but it takes years to drive an idea through a quarter-inch of human skull. (Charles Kettering)

Why is the human skull as dense as it is? Nowadays we can send a message around the world in one-seventh of a second, but it takes years to drive an idea through a quarter-inch of human skull.

Charles Kettering

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drive human idea second send skull world years

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