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It is from Crash Course Chemistry. It is at 1 minute and 44 second. Here it goes:
It is what we use to translate from the very small to the very big, to parley the stuff that we cannot see into the stuff we can.
I have looked up what parley means in a buch of dictionaries, but I cannot get what it means there.
In wikdtionary parley is defined as
(intransitive) To have a discussion, especially one between enemies.
But that doesn't seem to fit this context.
It isn't Parley it is Parlay, one meaning of which is (wiktionary) "To convert into something better."
So it means to "convert the stuff we can't see into stuff we can (and by making it visible, we make it better)
Its a fairly rare word, confusing because it is similar to "parley" (which was very rare until the Pirates films)
