Before you start...
A) What do these inventions all have in common?
They are all about technology and helps the human being to develop or get an easier life.
B) What is their purpose?
Most of them were created to help the human to do tasks that tey consider hard, or maybe they are just to have fun. It can be applied to different purposes.
C) How do they work?
They use technology just as satellites, electric circuits and antenas, that helps the machine to communicate or do wathever the person wants.