Research the use of waldoes. What is a waldo, and in what discipline is it most commonly used today?

Do some research on the differences between fantasy and science fiction literature. Is "Waldo" a science fiction story or a fantasy story? Why do you think so?

Research the levels of radiation that we receive from everyday appliances such as computers, televisions, and microwaves. How could these levels of radiation affect our bodies? Could Heinlein have been serving a warning to us against using such technologies? Use examples from the story to support your view.