It has something to do with the highly cohesive nature of the peanut butter. Like, why does it stick to the roof of your mouth but jelly doesn't? The viscosity of the peanut butter is very thick, whereas jelly is runnier. It spreads easier because it isn't as thick. Hope that answers it.

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THAT IS A QUESTION AS OLD AS MANKIND ITSELF. STILL MAKES ONE PONDER THE SPREADABILITY QUESTION OF ABSURDITY.

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