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Jack, I saw some great possibilities in this lesson.  I did get from this what I thought you wanted which was to see how water influences the rate of change in decomposition.  I also understand that you would have taught this with prior learning experiences.  I love the hands on and the topic you chose.  Very interesting.

Pros:

Love the sense of humor

I like the hands on

You often pointed out how this will relate to things later on down the road (future lessons)

I thought the vocabulary was very applicable to the lesson

Suggestions:

Be careful how much humor you use, may diminish the value students place on subject matter

Try not to answer your own questions.  Let students think first and give thier perspectives

Focus on what you are doing, to many of your own personal asides may confuse people.

Well done, and thanks for being brave and going on the first day.