Make a crossword puzzle in Google Sheets after discovering How Kenya Became the Cradle of Humankind on Google Arts & Culture. Time to complete: 45-90 minutes

In this Cyberchase media gallery, a series of videos explores the relationships among fractions, decimals, and percents, which can be used to represent the same values in different ways. In the accompanying classroom activity, students shade in parts of squares and rectangles drawn on a piece of graph paper and express the shaded amount in the form of a fraction, a decimal, and a percent.

When do the actions of one branch of the federal government unconstitutionally intrude upon the powers of another branch? This article surveys the history of this question in historic Supreme Court cases.

Read about the privileges and powers exercised by Congress from a constitutional law perspective. Includes examples of many cases which have tested the limits of Congressional power in the history of the United States. Many links to relevant information are included throughout the site.

Important cases from Aguilar v. Felton to Everson v. Board of Education are reviewed. Discussion questions are included on this site.

Through this lesson and its series of hands-on mini-activities, students answer the question: How can we investigate and measure the inside of an object or its structure if we cannot take it apart? Unlike the destructive nuclear weapon test (!), nondestructive evaluation (NDE) methods are able to accomplish this. After an introductory slide presentation, small groups rotate through five mini-activity stations: 1) applying Maxwell’s equations, 2) generating currents, 3) creating magnetic fields, 4) solving a system of equations, and 5) understanding why the finite element method (FEM) is important. Through the short experiments, students become familiar with the science and physics being used and make the mathematical connections. They explore components of NDE and see how engineers find unseen flaws and cracks in materials that make aircraft. A pre/post quiz, slide presentation and worksheet are included.

Video writing prompt where students are asked to explain how lava is involved in the rock cycle. [0:32]

Demonstrates how to compute with positive and negative fractions and compare the answers. [5:59]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

The following education materials have been created to engage students with digitized Polish-American newspapers. Students will learn how to search the Chronicling America website to find evidence of the past, detect bias in newspaper articles, and place current immigration issues in a historical context.

The following education materials have been created to engage students with digitized Polish-American newspapers. Students will learn how to search the Chronicling America website to find evidence of the past, detect bias in newspaper articles, and place current immigration issues in a historical context.

Discusses many options of water treatment, the contaminants that the treatments are focused on, how the treatment works, and common treatment systems.

An article about the Declaration of Independence which covers the selection of the Committee of Five, Jefferson's writing, the presentation to Congress for approval, the problems in drafting, and the final changes which were made. Included is John Adam's letter to Timothy Pickering in response to questions about the document.

This site is designed for students to learn more about the FBI through age-appropriate games, tips, stories, and interactives. They also introduce students to their working dogs and show how FBI special agents and analysts investigate cases.

Watch these three video clips to learn how the recent resurgence of progressive massive fibrosis, the most severe form of "black lung" disease, in miners across Appalachia has been linked to the failure of coal-mine regulations to limit silica dust levels in these excerpts from Coal's Deadly Dust, FRONTLINE, in partnership with NPR. [9:51]

A three-part exploration of the Book of Revelation from the producers of FRONTLINE, the series on PBS. Includes descriptions of the book by university historians and biblical scholars, video clips from the series, essays about the book, and more.

Identify health issues facing Americans today and evaluate one's own food consumption. Examine the USDA food pyramid and the impact it may have had on weight gain and explore the impact of body image on young people.

Examine facts and figures on how teens use the Internet in this infographic from FRONTLINE: Generation Like. Ninety-five percent of teens use the Internet. The infographic details which forms of technology they use to access the Internet, which sites they use, what they do when they're online, and whether they care about privacy.

Review the risks, benefits, hopes, and fears associated with biotechnology and bioengineered food crops. Find in-depth interviews with genetic scientists, food industry representatives, farmers, and critics of biotechnology. Accompanying interactives let you compare traditional and transgenic methods of breeding plants and examine new ideas for genetically modified foods now in development.

Examine the contrasting approaches taken by South Korea and the United States with respect to diagnostic testing as a tool to contain the spread of COVID-19, in these videos from The Virus: What Went Wrong? Use this resource to learn about the benefits of aggressively responding to a disease outbreak and consider the public health consequences of failing to do so. [12:56] This site includes 3 video segments.