How did that get to my house?

Explains what a telephone is, and looks at the workings of landline telephones and cell phones.

Explains what water is, how it is captured and stored, how it is cleaned and moved, and how it arrives in individual homes.

Describes how the United States Postal Service handles mail, discussing processing, sorting, and delivery.

Provides an introduction to the World Wide Web, explains how the Internet works, and looks at ways to connect to the network.