Lettuce Gets a Healthy Sun Tan

Salad dressing aside, a pile of spinach has more nutritional value than a wedge of iceberg lettuce. That's because darker colors in leafy vegetables are often signs of antioxidants that are thought to have a variety of health benefits. Now a team of plant physiologists has developed a way to make lettuce darker and redder--and therefore healthier--using ultraviolet light-emitting diodes (LEDs).

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