Autumn may have more cozy signifiers than any other season—though we all have our own favorites. Maybe for you it’s sweater weather, football games, spooky season, apple picking, leaf peeping, or mainlining candy corn. Whatever it is, in today’s episode we’re looking closely at three of these autumnal staples.

First, we get to the bottom of a recurring complaint about the taste of the pumpkin spice latte. Then we gaze deep inside the enigma hiding inside colorful fall leaves. Finally we ask some hard-hitting questions about the seasonal availability of an elusive cookie. Snuggle up and enjoy!

In this episode, you’ll hear from author and podcaster Don Martin who has a new audiobook out about loneliness called Where Did Everybody Go?. We also speak with Simcha Lev-Yadun, professor of botany and archeology; Susanne Renner, botanist and honorary professor of biology at Washington University in St. Louis; and Prospect Park Alliance arborist Malcolm Gore. And you’ll also hear from Lauren Tarr, who runs the blog Midlife Moxie and Muscle, and her mother Grace Dewey, along with Caroline Suppiger, brand manager at Mondelēz.

We’d also like to thank Brian Gallagher, Tom Arnold, Sylvie Russo and Laura Robinson.

This episode was produced by Katie Shepherd. Decoder Ring is also produced by Willa Paskin, Max Freedman, and Evan Chung, our supervising producer. Merritt Jacob is Senior Technical Director.

If you have any cultural mysteries you want us to decode, email us at [email protected]  or leave a message on our hotline at (347) 460-7281.

Get more of Decoder Ring with Slate Plus! Join for exclusive bonus episodes of Decoder Ring and ad-free listening on all your favorite Slate podcasts. Subscribe from the Decoder Ring show page on Apple Podcasts or Spotify. Or, visit slate.com/decoderplus for access wherever you listen.

Learn more about your ad choices. Visit megaphone.fm/adchoices