The document discusses mass media and the importance of critically evaluating the information we receive from different media sources. It notes that Americans now spend around 9 hours per day using mass media like television, phones, and the internet. However, we often accept this information without critical thought. The document emphasizes the importance of media literacy skills to thoughtfully analyze messages and consider factors like biases, reasoning, and potential effects. It also examines how mass media has evolved over time with new forms like the internet and social media, and issues around ownership and the shifting focus of news coverage. Throughout, it stresses applying critical thinking to ensure accuracy, balance, and understanding of the many media sources that now shape our lives.