meaning of the phrase “the why and the how of something”?

It is from TED talks. It is at 1 minute and 59 second. Here is the context:

We are begining to glimpse the why and the how of beauty, at least in terms of what it means for the human face and form.

Could you please rephrase the sentece for me?


Source : Link , Question Author : Dmytro O’Hope , Answer Author : Community

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