Yeah, just commenting because I had no idea what this was so looked it up. A couple of answers down the list here: https://physics.stackexchange.com/questions/9106/what-exactly-is-meant-by-the-gaussianity-of-cmbr
Has some explanations that don’t require a higher degree in mathematics to understand.
Not sure there is an ELI5 for this one; a challenge for some real mathematicians perhaps…
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