Are all measuring cups equal? I think not and I found this out when I recently purchased a measuring cup for liquids. My hummingbird feeder holds approximately one cup of liquid. I had been using my 2-cup measure to make the food for months. I made one cup of food with my new 1-cup measure and it was too much liquid for the feeder. How can this be since I made 1 cup like I usually do? It shouldn't really matter if I use standard measuring cups. Well the scientist in me had to determine the difference. I measured…

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