“Fall Color Is Key.” Trees Are Key, Episode 21. The first 6-minute segment of this podcast explains why deciduous trees drop their leaves and what causes their leaves to change color, and answers commonly-asked questions about fall color. Geared for adults, Trees Are Key is a series of over 300 podcasts by Texas A&M Forest Service. See https://tfsweb.tamu.edu/podcasts/treesarekey/ for the full list.