Indoor lettuce-growing is in vogue. And it’s being taken over by robots.In 2016, Japanese vegetable production company Spread plans (pdf) to begin building a lettuce factory in Kyoto that produces 30,000 heads of lettuce per day, or 10 million heads annually, using a growing technique that’s almost entirely automated. As of last year, the world’s largest vegetable factory by square footage, also located in Japan at an abandoned Sony factory in Miyagi Prefecture, produced roughly one-third of that amount per day, according to National Geographic. And more of the work there was done by hand.

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