In this episode, Anna Ploszajski talks to dendrochronologist and Professor of Tree Ring Research, Valerie Trouet. Valerie's book, Tree Story, is the history of the world written in rings. It's available from all good and ethical book stores.

Follow Valerie on Twitter (twitter.com/epispheric) and Instagram (www.instagram.com/valerietrouet) and find out more about dendrochronology on the Laboratory of Tree-Ring Research's website (ltrr.arizona.edu).

Thanks to Dave Shephard (www.daveshephard.com) for our cover art, and Alex Lathbridge (www.alexlathbridge.com) for the music mix.

Follow the podcast on Twitter at twitter.com/rialtalk, and find out more about Anna Ploszajski at www.annaploszajski.com.

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