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

Scientific article explaining what natural selection is, and how it manifests itself through genetics and from generation to generation. Natural selection is compared to genetic drift, both of which cause evolution to occur. The limits...

Learn about atomic structure and the multiple theories of atomic structure in this simulation.

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.

An interview with Douglas Futuyma, renowned evolutionary scientist, explaining the theory of natural selection and how it steers toward evolution.

Svante Arrhenius was born in Vik, Sweden, and became the first native of that country to win the Nobel Prize. The award for chemistry was bestowed to him in honor of his theory of electrolytic dissociation. Arrhenius also developed the...

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

This fundamentals of physical geography site provides a good overview of this early theory on the development landforms and the scientists that were involved in its conception.

[Free Registration/Login Required] A detailed lesson with downloadable PowerPoints and student handouts that examines how the study of comparative embryology provides support for the theory of evolution.

The Library of Congress has over 200 original dance manuals from 1490 to 1920. This resource includes essays and treatises on etiquette, dance theory and history, theatrical dance, music for the dance, and more.

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

Spanning three centuries of history, from the dawn of the industrial age to modern times, three diverse thinkers developed their own landmark theories on commerce, labor, and the global economy. The three economists profiled in this...

[Free Registration/Login Required] This flipchart will help students understand the order of arithmetic operations with rational numbers. It includes exercises and assessment questions.

This essay from the NOVA Web site explores the impact Einstein made on physics and most everything we know about the cosmos.

Describes the recent movement known as "informal logic." Summarizes its brief history, provides several detailed examples, and explains its relationship to philosophy. Bibliography included.

Read the fascinating transcript of the proceedings in court when Clarence Darrow called William Jennings Bryan to the stand to expose the weakness in his argument against evolution in the famous Scopes trial.

As a chemist, you will learn to deal with complex mixtures of many compounds. In this interactive activity, you will learn the basis of separations using acid-base extraction. In the virtual lab you will simulate an actual experiment and...

There's an old saying that "the clothes make the man" (or woman, we're quick to add nowadays). How true do you think this is? Here's a project with one approach for finding out.

The complete original text of On the Origin of Species by Charles Darwin.

This lecture covers the topic of life now and into the future, including the role genetic engineering will play.

Charles Darwin's famous journey is chronicled here in this online book. Read it just as it was published in 1845.

Virtual learning course in which students explore the abstract concept of Intelligence. Students can watch a presentation, read informational text, and participate with interactive learning material.

Examine the Vietnam War through this summary, the transcript of the Gulf of Tonkin Resolution, questions for analysis, references for further reading, and a question/answer section from the community.