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To make the nanoparticles, the researchers grew black-eyed pea plants in the lab and infected them with cowpea mosaic virus.

“I’ve seen people cry plenty of times when talking to me about the black-eyed pea soup,” he said during one of several interviews.

This sweet potato and black-eyed pea soup, from “The Blue Zones American Kitchen,” fits right into his message.

And however much development we see, what won’t disappear is the paper twisted around black-eyed pea sandwiches — the city’s classic breakfast food — sometimes a newspaper decades old, sometimes a child’s homework, sometimes a voting ballot.

The fresh black-eyed pea is a wonder of markings all its own, with that deep purple-black O-ring in the same spot on every tiny little pale green pea.