[Free Registration/Login may be required to access all resource tools.] An introduction to Charles Darwin and his theory of evolution by natural selection is offered for students. Meet the writers who influenced Darwin to develop his...

Online collection of articles and excerpts about critical theory from contemporary writers.

[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will explain the law of conservation of mass, the law of definite proportions, and the law of multiple proportions. They will also...

Read about three theories of Imperialism and how actions by the United States in the late 19th and early 20th centuries were driven by one or perhaps all three of the theories.

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.

Discover Alfred Wegner's ideas relating to continental drift and seafloor spreading which are both evidence to the concept of plate tectonics.

This site from the Northern Illinois University gives general background information on probability and also includes books and other websites that contain information on Probability.

Virtual learning course in which students investigate theories of human development through multi-media and interactive learning activities. Comprehensive set of learning materials included.

Virtual learning unit on the theories of personality and the study of stress. Students will find a variety of engaging activities including a personality test, introvert/extrovert experiment, presentation, and video series in addition to...

[Free Registration/Login may be required to access all resource tools.] Find out how coevolution can occur in nature and identify the endosymbiotic theory.

Based off of the hit television show NUMB3RS, this lesson introduces students to one of the prominent algorithms in graph theory used to find shortest paths -- the Djikstra Algorithm. The lesson includes four graphs of increasing...

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."

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

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.

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...

"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...

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

1HNMR theory begins in the nucleus of hydrogen. Complete this tutorial on the 1HNMR spectrum graph to learn about the number of equivalent hydrogens, b) the chemical environment of each hydrogen type and c) the number of neighbouring...

Find out about the theories as to how Oetzi the Iceman died over 5,300 years ago. Oetzi's remains were found in 1991 by hikers in the Italian Alps.

Article reports on a theory that Queen Nefertiti may be buried in a hidden chamber inside the tomb of King Tut. Includes video.

Learn more about the theory that dogs evolved from wolves in this video from Nature. [5:03]