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Marv-Unfortunately in today's world, in some districts, you need to have your clearances along with a background check in order to enter a classroom. This applies to the parents as well. I live in the sticks and this is how our district operates.
Marv,I don't recall seeing your breath-powered engines described anywhere. I assume they're wobblers. What is the approximate bore, and what materials do you prefer? Is there an issue with -ahem- saliva?