Rights and Liberties: The "Silent" Ninth Amendment Gives Americans Rights They Don't Know They Have

Amendment IX
The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.

Although the constitution lists various rights that are retained by the people, the founding fathers realized that there were other non-listed rights that should be protected.

AlterNet: Rights and Liberties: The "Silent" Ninth Amendment Gives Americans Rights They Don't Know They Have