Yoostar is one of the coolest tools I have ever used in my classroom. It is a green screen that allows the students to go on location without ever leaving your classroom. Students can do their report from the moon, The Great Pyramid, The Great Wall of China, in the middle of an on-coming thunderstorm, and even from the beach on some tropical island. The backgrounds move just as though the student were actually there. I have provided a link with this article that will allow you to view a students presentation from the Colosseum (link). Because it is a recording, the students are able to redo the presentation until they feel they have a "Good One". This allows you to grade the best presentation and not the nervousness of the student. The best part about Yoostar is that it is only $100.00. This is not something that costs thousands of dollars. It will truly enhance your lessons, and the other nice thing is that you are able to save the presentations for years to come.