As John Arnold pointed out, the museum world is related to education. However, museum-l is an informal discussion group, not an academic journal. Errors in spelling and grammar do appear and sometimes make me cringe, but I try to overlook them for that reason (I know I make mistakes myself.) If you do feel the mistakes someone has made are worth correcting, I think it would be a lot nicer to send a note to the person privately, instead of embarrassing them again by posting it to the entire list.