On the last day of school this year, my 8th grade students gave me one of the greatest salutes a teacher can get.   They reenacted the closing scene of “The Dead Poets Society.”   You know. The one where Robin Williams’ Mr. Keating has been fired from a boarding school for teaching his students to embrace life, and as he collects his things and leaves, the students get up on their desks as a testament to his impact and…