Sep. 23, 2014 - 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 https://www.youtube.com/watch?v=X0nWmTeQPfo.
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