Students determine the refractive index of a liquid with a simple technique using a semi-circular hollow block. Then they predict the refractive index of a material (a Pyrex glass tube) by matching it with the known refractive index of a...

In this activity, students tackle this aspect of engineering as they solve problems for precise angles and speeds, and predict data output when samples are altered.

See how Earth's temperature would change if the Sun's brightness increased or dimmed or if Earth's albedo was different.

Students will analyze historical records of the House and Senate to understand the sequence of steps in the legislative process. The students will work collaboratively to study documents and identify the step in the process that each...

Read about the mood of the United States people in 1980, and see how Ronald Reagan's agenda reflected that mood.

Learners reflect on their responsibilities as creators and users of creative work. Requires Adobe Reader.

How did the American Revolution reflect a change in American society? Read about how political participation increased across the classes, and see how the question of slavery and women's rights became a thorn in the side of those...

While tragic mass shootings like the ones in Las Vegas and Orlando shine a spotlight on our nation's lax gun laws, these horrific events make up a tiny percentage of U.S. gun deaths. Suicide, other types of homicide and accidents play a...

This hypertext physics course tutorial on nonfocusing surfaces relates various design principles to good auditorium design. Illustrated.

A tutorial from a hypertext physics course book that discusses reverberation. Illustrated.

A site dedicated to help students prepare for the AP Physics B test. This specific site reviews waves including traveling waves, standing waves, resonance, speed of electromagnetic waves, Doppler shift, Doppler effect, interference,...

The principle of total internal reflection is discussed in this article. The appearance of objects from inside the water of a swimming pool is compared to the path of light in a fiber optic cable.

Here is a general description of the gradual change from using indentured servants to recognizing Africans as slaves and the laws reflecting this change.

This site has many links to examples of inverse functions, including intersections, inverse by reflection, and graphing inverse functions.

A collection of video lectures from a physics course focusing on vibration and waves taught at the Massachusetts Institute of Technology. The course overviews topics dealing with mechanical vibration and waves with twenty-three lectures....

"In this lesson, students reflect on the Holocaust from the point of view of those who actively resisted Nazi persecution." "includes images which should be reviewed in advance for their potential impact on students."

This resource provides a definition of RTI, reviews essential RTI components, and responds to frequently asked questions. This document lays out four essential components of RTI: a school-wide, multi-level instructional and behavioral...

Congress is made up of a group of people who work together to improve the quality of lives of citizens throughout the nation. Long ago Congress decided that it was important to pass labor laws to protect children. Why did they think that...

In this scaffolded lesson, students engage in practice with determining whether or not research has been plagiarized. A short video demonstration is included. [03:44] This lesson addresses all three College and Career Readiness Standards...

Henry II of England (5 March 1133 - 6 July 1189) ruled as King of England (1154-1189). Henry was the first of the House of Plantagenet to rule England and was the great-grandson of William the Conqueror. Like his grandfather, Henry I of...