In this case, a medium is something through which or by which information is conveyed. Some provide pictures. Some give in-depth information. Some give a quick overview. The average teen watches TV approximately 23 hours per week.
Stories are a basic human convention.
They are a means of transmitting the lessons of life. They are a means of coming to grips with emotional events. They are a form of entertainment. Pace of the show. Read the credits to find out who put the movie or TV story together.