[Free Registration/Login may be required to access all resource tools.] Today most people realize that microorganisms, such as bacteria or viruses, are the cause of disease. This concept is known as the germ theory of disease, one of the...

[Free Registration/Login may be required to access all resource tools.] Covers scientific theory and scientific laws.

[Free Registration/Login may be required to access all resource tools.] Explains scientific theories and introduces several famous theories in biology.

[Free Registration/Login may be required to access all resource tools.] Nature of scientific theories, examples of physical science theories, and the law of parsimony.

[Free Registration/Login may be required to access all resource tools.] Students will understand the difference between theories, hypotheses, and laws in science.

This brief review explains that a scientific theory comes from testing an idea.

[Free Registration/Login may be required to access all resource tools.] Tutorial provides an understanding of the scientific method and how it is used to study the world around us. Students will learn about scientific inquiry and be able...

This page outlines the scientific method, step by step.

[Free Registration/Login may be required to access all resource tools.] Nature of scientific laws, examples of physical science laws, and how scientific laws differ from scientific theories.

Article describing early efforts, beginning with Aristotle, to determine the Earth's age, and the influence of current culture on the acceptability of new and radical scientific theories. Questions are posed throughout about the nature...

The definition of a theory as it applied to science is explained in this brief article. "Explain It In 60 Seconds" is an article series that aims to summarize in a few paragraphs the meaning of different concepts in particle physics.

[Free Registration/Login may be required to access all resource tools.] Students learn about scientific explanations and interpretations through instructional videos, grade-level texts, interactive activities, and quick assessments.

Differentiate between scientific laws and theories. Identify examples of scientific theories and use evidence to support them.

Power Point presentation on scientific method for NAS 102 Human and Environmental Biology II.

[Free Registration/Login may be required to access all resource tools.] This lesson looks at how the scientific method is applied in a scientific investigation, and at the differences between theories and hypotheses in science.

Here you can find a detailed overview of the scientific method. Content addresses what the scientific method is, its four steps, some common mistakes when applying the scientific method, and more.

Explore the thinking of Charles Darwin, and read how his theory of evolution survives, thrives, and shapes the way we learn about nature. (February 2009)

[Free Registration/Login may be required to access all resource tools.] Introduces the scientific method and presents the difference between a theory and a law.

[Free Registration/Login may be required to access all resource tools.] Examines theories and laws in science.

[Free Registration/Login may be required to access all resource tools.] Examines theories and laws in science.

[Free Registration/Login may be required to access all resource tools.] Examines theories and laws in science.

[Free Registration/Login may be required to access all resource tools.] Examines theories and laws in science.

[Free Registration/Login may be required to access all resource tools.] Describes scientific problem solving and the scientific method.

Article outlining the scientific history behind the discovery of black holes. The writer discusses how scientific theories guide scientists in creating explanations for natural phenomena.