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The Japanese are leading the way with the world's largest indoor garden and it's hydroponic, putting out 10,000 heads of lettuce, per day! This is a money maker, people! I figured conservatively, $2.66 million annually from about half an acre Link: http://inhabitat.com/the-worlds-largest-indoor-farm-produces-10000-heads-of-lettuce-a-day-in-japan/