This guided lesson summarizes the historical development of atomic theory.

Explains and compares Karl Marx's and Max Weber's theories of social stratification.

A comprehensive biographical slideshow of Swiss born scientist, researcher, Jean Piaget featuring his work studying his children to establish his theory of cognitive development.

Includes short profiles of Noam Chomsky and B. F. Skinner, details of their ideas on language acquisition, the limitations of each perspective, and a chart of similarities and differences between their theories.

Find a quick, concise explanation of graph theory. Examples are given and clearly explained.

Check out this slideshow on Plate Tectonics-The unifying theory for all other theories in the Earth sciences-Has resulted in a more detailed understanding of Earth history-Has enabled geologists to more precisely(and cheaply) discover...

An indexing page for an elaborate and in-depth hyper-textbook on various physics topics. This page indexes several others which pertain to human ability to perceive sound and recognize pitch. Introduces and explains Place Theory.

Find a quick, concise explanation of how to find the degree of a vertex in graph theory. An example is given and clearly explained.

This lesson introduces the concept of a theory and explains what it represents. It is 2 of 4 in the series titled "Theory."

This lesson introduces the concept of a theory and explains what it represents. It is 4 of 4 in the series titled "Theory."

This presentation deals with the factors that impact on the learning process as posited by Piaget, Bloom, Bruner, and Ausubel.

Definitions and examples of the fundamental notions of graph theory.

Find a quick, concise explanation of an endvertex. An example is given and clearly explained.

After an introduction, this site breaks down into sections discussion quantum theory, including A Quantum Theory for Energy, A Quantum Theory for Atomic Structures, Waves or Particles, Quantum Mechanics, and Interpreting the Quantum World.

Wikipedia offers detailed information on the Phlogiston Theory, a discredited 17th century theory hypothesis regarding combustion.

Full-text English translation of Gestalt Theory (1924) by Max Wertheimer.

Comparative analysis of Behaviorism and more clinical psychological theories of behavior. Behavioristic arguments, criticisms of Behavioristic arguments, and Behavioristic responses are presented. References, suggested readings and...

Slideshow explains Robert Thomas Malthus' theory on the effect of overpopulation on economics, resources, and geography.

An infographic describing nine "thresholds of increasing complexity" associated with the Big Bang theory.

A guided lesson explaining Democritus' description of matter as discontinuous.

This site lists Plutchik's ten postulates for psychoevolutionary theory on emotions, and provides basic emotions and a basis for inclusion for each. Also includes a bibliography.

PBS site explores the history of the Universe by providing users with a Universe Timeline exploring different theories. Site also contains links to a tour of the Universe, birth of a Supernova, additional resources and much more.

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

Collection of articles ranging from basic to advanced on aerodynamics theory.