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Published: April 28, 2020, 7:20 p.m.

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This week we talk about PET, Celluloid, and biodegradability.

We also discuss polyurethane, fungi, and shellac.

This is a public episode. If you\\u2019d like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe'