Watch the short video in the following link and answer the question given in test your knowledge section. https://www.youtube.com/watch?v=DNUwZctwwhw : Briefly describe the main points highlighted in the video. 

Watch the short video in the following link and answer the question given in test your knowledge section.

https://www.youtube.com/watch?v=DNUwZctwwhw

: Briefly describe the main points highlighted in the video.