[ Kids/Teens/Mature Teens ] Explains how they developed from the original Chinese invention.

[ Kids/Teens/Mature Teens ] A collection of fact sheets about inventors and their inventions.

[ Kids/Teens/Mature Teens ] Virtual museum includes photographs and brief descriptions of the tools of a bygone era.

[ Kids/Teens/Mature Teens ] A brief history summary from weapons to space travel.

[ Kids/Teens/Mature Teens ] From the tricycle lawn mower to the diaper alarm, read about some of the strangest patents ever applied for.