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Great information. I really liked the idea of playing on the necessity vs. sufficiency "thing" we came up with.  I think you really hit on that and your metaquestion was very deep into really a simple everyday life situation of buying tuna.  But I think you really showed how to connect everyday issues that we give little consideration to into a relevant and complicated subject matter.  You made great connections and really seem very well versed in the topic.  I think your presentation was very well planned.  I would only caution that you should limit the amount of content on each slide when appropriate.  It can at times be a lot to read.  But it was all relevant and I will most definitely consdier the type of tuna I buy in future shopping endeavors.