As far as the quiz was concerned, #3: "Black coffee = homogeneous, but not pure..." tripped me up, but perhaps I was overly skeptical; I thought it was a trick! It did not occur to me at first that a mixture could be homogeneous and not pure, as I thought homogeneity being evenly distributed molecules sort of indicated purity. The quiz was great help for this kind of distinction.
In natural science, which I have not studied since high school (not too long ago, really - 1999-2003) words have specific and nuanced definitions that may be a bit different from the way I've been accustomed to using them, and it's good to start out laying everything on the table in terms of what is meant in using specific terms.
My favorite moment of reading the Chemistry Definitions website was the first anecdote about phenylethanol in roses and phenylethylamine in the human response to being in love!
It seems to me that "convenient" or "coincidental" discoveries like this shock Western science (or at least are presented as astounding in media reports) when they are much less riveting in Chinese Medicine, being a tradition steeped in metaphor, with correlations like the 5 elements being associated with senses, flavors, colors, directions, etc. Of course everything that seems related is truly, actually, essentially associated! It is, on the other hand, truly exciting to find Western Scientific Discoveries supporting observations humans have made over the millennia.
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