"Today we will be looking at your unknowns. It is up to you to consult the book on how to diagnose each one."
*boy raises hand*
"Sir I don't think there enough microscopes to go around. And one of my test tubes broke."
"Well we can double up on microscopes and I will check to see if we have any extra tubes in the back. While I am looking I'd like you to pair up and begin adjusting the microscopes."
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