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Re:The Complexity of Coffee (2002) [pdf] by dpflan on Wednesday September 14, 2016 @02:14PM (#12499725)
It sounds like you'd enjoy this Food Biophysics paper on Espresso Crema - http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140933/

Related HN Submission with comments: https://news.ycombinator.com/item?id=12489523

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