ELI5 Saunas - how do near boiling temperatures not burn you?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Do Saunas and Steam rooms offer any actual health benefits? Do they help one’s skin? What happens to your body in a sauna? How can I sit in a 85 degree celsius sauna and not get burned, while water of the same temperature would scald badly? What is the Finnish connection? How do wood structures in saunas not rot or get moldy?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: billsauntieshouse, boobooaboo, maxweehus, saedius, groundbreakingcar379, sinistercheese, misomiso82 and onwardupwardforward

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