I really enjoyed your lesson on population growth. The lesson was cross-curricular (science and social studies), it was succinct, and it clearly addressed the intended objectives. I also think that a Camtasia presentation fits well with the UDL principles as this lesson would address the needs of a number of different types of learners. My only concern is the length of time you spend on each slide. Although it's important to thoroughly explain the information on each slide I tend to lose focus when the information is not changing. After about a minute on one slide I think students might lose focus as well. Finally, the quizzes were a nice addition as they allowed students to review throughout the lesson rather than just waiting until the end. Great job!