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"... Avoid refrigerating coffee, as cold coffee beans immediately attract humidity from the environment when taken out of the refrigerator. Freezing coffee is even worse. Natural oils in the bean denature as moisture in the bean freeze. This changes the flavor of your coffee dramatically."
"I'm going to limit the technical and statistical minutia presented here since the results were "negative," which is to say that there were no statistically valid differences shown. Jim Schulman and I are planning to write another article dealing with experimental design and the scientific method as they apply to research into coffee and espresso. We will use this study and some of its more detailed results as examples in that paper. If you are interested in seeing the raw data obtained in this study, it can be found in both table and graphical form in the section at the end of this article.
When the results were examined according to the three scored parameters, the overall preference, the crema, and the intensity of the taste and aroma, no statistically significant differences were noted among the coffees studied or the other variables of the study. What this means is that none of the tasters could consistently differentiate among the shots made with previously frozen or never frozen coffee. Similarly, none of the tasters could consistently tell the difference based upon whether the shots came out of the newer rotary pump driven or the older vibratory pump driven espresso machine, nor between the two grinders, one of which had brand new burrs and the other with more heavily used burrs. ..."
Now that I'm off, I get sleepy right after lunch and kind of drag the rest of the day. I noticed if I drink Coke, which I despise, I would perk back up again. So thats why I am looking for a new stimulant.