ELI5 Disinfectant Alcohol - why is 70% alcohol better than 90% as disinfectant?

What makes 70% alcohol a better disinfectant than 90% alcohol? What is the pancake alcohol analogy? What is Isopropyl alcohol?

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Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: pixie_laluna, studentdoctor_kenobi, butterchest & okimintrigued

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