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 Can't wait to share this with the Bio teacher at my school and my dept head who teaches integrated science.  Both of them will find this useful.  I liked the discussion at the beginning of the lesson, while I might have wanted more direction, I was engaged.  The open global discussion, followed by the focused quantitative lab, connected back to the global questions put an interesting spin on things.  Here is a link to software called Logger Pro, produced by a company called Vernier.  You do not need their hardware to make very effective use of the software.  When looking at the graphs, Ed suggested that the area ‘under the curve’ should be the same, I thought of Logger Pro; cut and paste the data from Excel and it will do the integration for you, for a quick comparison.  That one tool is the tip of the iceberg, it is a superb analysis tool.  Site license is only $189.