This lesson focuses on developing a way to cross all 7 Bridges of Konigsberg without crossing any of them more than once. Euler discovered it was impossible, but he developed the idea of using graph theory to determine if it would be...

This lesson provides an introduction to graph theory including directed graphs, disconnected graphs, subgraphs, and order and degrees of a graph.

Leon Cooper shared the 1972 Nobel Prize in Physics with John Bardeen and Robert Schrieffer, with whom he developed the first widely accepted theory of superconductivity. Termed the BCS theory, it is heavily based on a phenomenon known as...

Paul Adrien Maurice Dirac was an outstanding twentieth century theoretical physicist whose work was fundamental to the development of quantum mechanics and quantum electrodynamics. He was awarded the Nobel Prize for Physics jointly with...

This site from the Stanford Encyclopedia of Philosophy discusses the logical theory of true contradictions, known as paraconsistent logic. Article addresses the history of the theory's development and a technical presentation of its...

A comprehensive site from the Internet Encyclopedia of Philosophy on Sigmund Freud and his psychoanalysis theory. Discusses his reasoning for thinking the way he did, his theories behind psychoanalysis and the unconscious, and the site...

Bite-size introduction to two scientists-Hubble and Lemaitre-who played key roles in formulating the theory of the origin of the universe known as the big bang. Includes an interactive timeline on which you can plot out the approximate...

These pages are part of a site called "Evolution," that accompanies a textbook by the same name. Mark Ridley is the author. Here he discusses theories for species change that were before Darwin published "On the Origin of Species."

This profile of Milton Friedman includes a short biography plus hyperlinks to his works and theories.

James Prescott Joule experimented with engines, electricity and heat throughout his life. Joule's findings resulted in his development of the mechanical theory of heat and Joule's law, which quantitatively describes the rate at which...

In a career that lasted seven decades, Max Planck achieved an enduring legacy with groundbreaking discoveries involving the relationship between heat and energy, but he is most remembered as the founder of the "quantum theory."

[Free Registration/Login may be required to access all resource tools.] Overview of the evolution of life and Darwin's theory of evolution.

Explains the logical theory of "many-valued logic," a modern alternative to classic logic. Sections address its history, notation and proofs, and applications to linguistics, mathematics, philosophy, and artificial intelligence. For the...

Describes the notion of "dialetheism," the logical theory of true contradictions. Explains its history of development, its philosophical consequences, and its significance for rationality. Excellent bibliography.

An interesting article that discusses a possible genetic link between a man named Lawrence Berry who could be a descendant of the lost Roanoke Island colonists. It explains some history of the colony, possible theories about the...

This lesson focuses on probability theory for predicting the outcome of flipping a coin, and then flipping it multiple times.

This is a fantastic site that teaches basic music reading, especially as related to the guitar. Although the site is a promotional software site, the trial version is excellent by itself.

[Free Registration/Login Required] This flipchart will help students understand the four basic arithmetic operations. There are activities to give them practice using them to solve problems. Assessment questions are included.

A page containing an interactive JavaScript form which allows the visitor to investigate the relationship between various state variables. Visitors input values of a few variables and observe the effect upon the other variables. Options...

Charles' law is derived from the ideal gas law. An equation of the ideal gas law under pressure constraints is given and the derivation is explained.

This is part of a small radio show at the University of Houston. It talks about how John Dalton came up with his version of chemical notation, and how it differs from our version of it today. It is available in audio form also.

"The survivals and extinctions at the close of the Cretaceous are such as might be expected to result from intensely hot winds such as would be generated by extra large meteoritic impacts." This article suggests that this theory should...

This site explains prime number theory and how to find prime numbers.

A brief biography and discussion of Aristarchus' theories provided here.