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Published: June 26, 2018, 8:07 p.m.

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This week we talk about whale oil, the DEC2 gene variation, and the economic costs of insufficient sleep.

We also discuss LEDs, luminous efficacy, and contemporary sleep science.

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'