Back in the good old days, farming was easy. Throw some seeds in the ground, keep it watered, pray to your preferred deity to spare your crops from pestilence and wait for harvest season. But with the global population closing in on 7 billion mouths to feed, humanity is going to have to figure out how to grow more food using less land and fewer resources, and soon. So while some researchers and equipment manufacturers are devising intelligent agricultural implements that will toil in tomorrow's fields on our behalf, others are aiming to bring futuristic farms to urban city centers. "Over three billion dollars were lost in California alone [in 2017], because there's not enough people to actually do the operations in seeding or harvesting," Brandon Alexander, co-founder of Iron Ox Robotic Farms, told Engadget.