Youtube Quiz

First go to the page http://techcrunch.com/2012/09/20/youtube-video-questions-editor/
Click on the first link which will send you to this page http://www.youtube.com/video_questions_beta
Go to your account and click one of yhour videos you have done
then they will give you the option of edit.
When you click edit they give you the option of questions
You can answer they question through out the video.
This is the video I did with questions.
http://www.youtube.com/watch?feature=player_embedded&v=fyDSZX2Cdlc
This app could be useful when you are doing research because it may help you pay attention of little details