Propose a speech that you would give to a friend in an elevator summing up the contents

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Question:

Propose a speech that you would give to a friend in an elevator summing up the contents of this course. You have 30 to 90 seconds to inform your friend of the most important elements. Go!

Rate the three (3) most important concepts that you learned in this course in order of importance (one [1] being the most important). Provide a rationale for your ratings.