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WASHINGTON, Sept. 22, 2014 � It’s the first day of autumn, and the telltale signs are here: crisp weather, pumpkin spice lattes and, most importantly, the leaves are changing colors. Ever wonder why some leaves turn red, others yellow and some just turn brown? We’ll tell you all about the chemistry behind this seasonal spectacle in the latest Reactions episode. Learn all about it at

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The American Chemical Öйú365betÖÐÎĹÙÍø is a nonprofit organization chartered by the U.S. Congress. With more than 161,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.