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Astronauts living at the International Space Station took their first bites of space-grown lettuce Monday, in what scientists described as another step toward enabling human missions to Mars."Tastes good," U.S. astronaut Scott Kelly agreed, who is spending one year at the research station.Wheeler said that the idea for using LED lights to grow food in space dates back to the late 1990s.A previous crop of lettuce was grown in space last year but was not eaten by astronauts.
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