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Published: April 10, 2018, 5:40 p.m.

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This week we talk about Galen, organs-on-chips, and the interstitium.

We also discuss microbiota, Ptolemy I, and commensalism.

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'