The Eustachian tube connects the throat and the middle ear (the site of a typical  ear infection ) and allows air to travel between them and equalize the pressures. When the Eustachian tube is temporarily pinched off, pressure can build up in the middle ear.
Visitation is a matter of state law, but generally speaking, every state allows parents to exercise a reasonable amount of visitation with their children, which generally means enough time to establish and maintain a meaningful relationship.
1. Classroom visitations to a master teacher's classroom to view a lesson being taught, along with an opportunity to reflect and debrief. 2. Reading an article on a new strategy and discussing it with colleagues in a study group. 3. Reviewing sample lesson plans and adapting them for your classroom.