Letters from Micah Barcalow’s fourth-grade class hang on the wall at Franklin Barbecue. (Photo ©Gary Jacobson/Texas BBQ Posse) Micah Barcalow teaches fourth-graders in Fort Wayne, Ind. He has never eaten at Franklin Barbecue, 1,200 miles away in Austin, Tex. But he did read Aaron Franklin’s book, Franklin Barbecue: A Meat-Smoking Manifesto. Barcalow says the book and its lessons — for barbecue and life — changed him, making him more willing to try new things and learn from doing. An excellent lesson for fourth-graders, too. That’s why Barcalow has inspirational quotes from the book — “Words of Wisdom from Aaron Franklin,”…