What's the deal with cold plunges and saunas?

This week, Emily and Perry plunge, as it were, into the temperature extremes: cold plunges and saunas. Is there any actual value to shocking your body with ice water or sweating out an ocean? Or are we just gluttons for punishment? 

Plus: soaring measles rates, Jay Bhattacharya's double federal appointment, and pandemics lurking under the ice.

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