Is There a Scientific Explanation for the Impulse to Picnic?

Do we all stand around barbecues out of some innate craving for seared meat in a cave?

Picnics were once fashionable social events, where guests brought elaborate potluck dishes to share. In the mid-19th century, they spawned a sub-genre of American landscape painting: the "picnic pastoral." They've since evolved into informal meals eaten outside and they're a sure sign of summer.

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