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Fall foliage is still a mystery: Why do some leaves turn red?
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Scientists know why leaves turn yellow in the fall: Chlorophyll breaks down, revealing the yellow pigment that was there all along. But red? Red is a different story altogether. Leaves have to make a new pigment to turn red. Why would a dying leaf do that? Scientists don’t really know. NPR science correspondent Nell Greenfieldboyce reports on the leading hypotheses out there. Read more of Nell's reporting on this topic . Interested in more seasonal science? Email us your ideas at shortwave@npr.org . Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave . See pcm.adswizz.com for information about our collection…