Implement a three-format newsletter system: tips (teaching ideas), question-and-answer (one reader question with long-form response), and mailbags (10-20 reader comments with brief responses)

Implement a three-format newsletter system: tips (teaching ideas), question-and-answer (one reader question with long-form response), and mailbags (10-20 reader comments with brief responses). Rotating formats keeps content engaging and addresses multiple reader needs.