I love your presentation. It is clear and understandable. These inventions have changed our lives. Let me quickly react to this:

Some advanced country now take records of what is happening even without a witness to be there, this is because of camera and internet inventions.

This is much true of CCTV cameras. They are used to monitor and record events live. In many public places, it is used to fight crime as the camera captures everything, including criminals. I really hope it will be put to good use in our cities. @justiceanietie