I found this lesson to be an outstanding example of helping students to think critically while teaching a core concept critical to all science instruction. By allowing students to choose a problem/issue to investigate using the scientific method, the author took great strides to increase student enagement. Student engagement according to research is critical for student success.
I found the pedagogy supported the lesson by providing appropriate scaffolding. Teacher lead lecture/discussion moving eventually to group activities that encouraged creativity made for a comfortable and social environment which speaks to the social and emotional aspects of learning.
If I could offer some suggestions, I would insure the lesson included a few more audio and video supports that could help the more challenged learners to grasp the concept of the lesson. Also, if possible, I would provide some examples of examplar presentations from the past. Or as an extention, after groups present the material using technology, let volunteers carry out their investigation in real time.
The lesson is saved ina PDF format and opened without issue.