The structure of families in medieval and modern times, and the patterns they follow are examined. These include topics such as household composition, age of marriage, life expectancy, inheritance customs, financial resources, disruptive...

[Free Registration/Login Required] Describes changes occurring in the structure of the typical family in America. People wait longer to get married and the divorce rate is up, leading to more single parent homes and people living alone....

In this activity, students construct models of molecules using marshmallows and gum drops.

A good description of a particular family of viruses. Of interest due to the fact that AIDS is probably caused by a retrovirus.

A good page devoted to the RNA family of viruses that differ slightly from standard DNA viruses. Discusses the difference and characteristics of such viruses.

Article that looks at three types of business structures - sole proprietorships, partnerships and limited liability companies - and what the tax and non-tax implications are for each.