Sunshine and heat determine the brightness of fall leaves

Have you ever wondered why fall leaves are sometimes brighter then they were a year before? Well, it has a lot to do with sunshine and heat. Sunlight produces sugars in the leaves, which is important for creating anthocyanins pigments. It is this pigment that makes those bright red leaves! Neat huh?

http://www.sciencedaily.com/releases/2010/09/100928152804.htm

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