My Take
This is a pretty good sight i like the verity associated with it. I worked well for a supplemental tool the biggest problem is that it requires the teacher to do all the grading . it would do better with quizzes after videos
How I Use It
NASA's eyes on the earth is good for doing lessons for students with disabilities or those who need hands on work after giving the initial lesson i allow students to choose an activity from the site that will help them to understand the lesson. Such as watching a supplemental video, playing a game or doing a hands on activity.