This Japanese lettuce-growing vending machine has been making the blog-rounds over the last few months, both because it doesn't require sunlight (it uses fluorescent bulbs) and because of the surprising yield it can churn out: 60 heads a day, or over 20,000 a year.
Source:
http://www.treehugger.com/files/2010/11/vending-machine-grows-lettuce-without-sunlight.php
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