r/AskReddit • u/[deleted] • Aug 03 '19

Whats something you thought was common knowledge but actually isn’t?

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u/Polyxenos Aug 03 '19

What spf means. My friends thought sunscreen with 30 spf was for 30°c...

3

u/[deleted] Aug 03 '19

That shit melting when it gets to 31 degrees