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. Submit a question for our weekly mailbag at wellnessactually.fm.See omnystudio.com/listener for privacy information.