An explanation of Heider's balance theory along with an example that shows how the theory works.

Extensive coverage of South America prehistory. Site and links include enormous photo gallery, essays, and bibliographies for topics such as Chavin, Moche, and Inca cultures, cultural monuments, and migration theories.

Extensive coverage of South America prehistory. Site and links include enormous photo gallery, essays, and bibliographies for topics such as Chavin, Moche, and Inca cultures, cultural monuments, and migration theories.

Benjamin Franklin (January 17, 1706 - April 17, 1790) was one of the Founding Fathers of the United States of America. A noted polymath, Franklin was a leading author and printer, satirist, political theorist, politician, scientist,...

At a difficult time to be a woman mathematician, Germain was able to submit her works on number theory and receive some acknowledgement.

Good introduction to Venn's life and work. Explains especially his lifelong relationship to Cambridge. Includes links to further information on Venn's "probability theory."