In this video from Wide Angle, learn about the Arduous March, a dark period of hardship and famine in recent North Korean history.

This is an activity about comparing images of the Sun in different wavelengths of light. Learners will examine solar images taken by the SOHO spacecraft to look for differences in the features that are visible in the various wavelengths of light. This activity requires access to the internet to view or print images of the Sun. This is Activity 7 of the Sun As a Star afterschool curriculum.

Students learn that dams do not last forever. Similar to other human-made structures, such as roads and bridges, dams require regular maintenance and have a finite lifespan. Many dams built during the 1930-70s, an era of intensive dam construction, have an expected life of 50-100 years. Due to inadequate maintenance and/or for environmental reasons, some of these dams will fail or be removed in the next 50 years. The engineers with Splash Engineering have an ethical obligation to remind Thirsty County of the maintenance and lifespan concerns associated with its dam.

In this short video, host Dr. Ryan interviews graduate student Amy Steiker at the Institute of Arctic and Alpine Research about her research, using isotopes of nitrous oxide, connecting human activity to greenhouse gas emissions.

In 1893 the newspaperman Peter Finley Dunne began publishing a regular series in the Chicago Evening Post featuring dialogues between an Irish bartender named Martin Dooley, and his Irish friend and customer, Henessey. The local column quickly achieved national renown and syndication in newspapers across the country. Dunne's dialogues drew upon prevalent ethnic stereotypes that were a staple of late nineteenth-century American humor. Dooley regularly commented on both local and national events. Thus, it was not surprising that he would have something to say about the dramatic strike by the American Railway Union against Chicago's Pullman Palace Car Company that had shut down rail lines across the United States in 1894. In the July 7, 1894, column included here (read by an actress), Dunne poked fun at George Pullman's claims that the strike was a violation of the U.S. Constitution.

Weddell seal project researchers are investigating whether Weddell seal pups that spend more time in the water learning to swim with their mothers have a higher probability of surviving to return and have pups of their own. Weddell moms spend a lot of time with their pups coaxing them into the cold Antarctic water and helping their pups get in and out of the water as they learn to swim. During this time, Weddell pups are also nursing and gaining substantial weight from their mothers' rich milk before they are weaned and left to fend for themselves.

Personalized learning should not be devoid of standards. Standards give learners and educators a framework or matrix against which to evaluate and choose what to learn at what time and in what order. Quality standards can still provide plenty of room for learners and educators to co-design how learning will be approached, what goals will be most appropriate for the learner, what tools will be most useful, which strategies to employ, where and how learning will be accomplished and how best to show that learning has occurred.

In this problem, students are given a picture of two triangles that appear to be similar, but whose similarity cannot be proven without further information. Asking students to provide a sequence of similarity transformations that maps one triangle to the other focuses them on the work of standard G-SRT.2, using the definition of similarity in terms of similarity transformations.

There's a complaint we get pretty often around here, that our tagline contains the word "democracy," but the United States is *actually* a republic. So...do we need to make a change? We dig into that question and a whole lot more on this episode.

The year is 2032 and your class has successfully achieved a manned mission to Mars! After several explorations of the Red Planet, one question is still being debated: "Is there life on Mars?" The class is challenged with the task of establishing criteria to help look for signs of life. Student explorers conduct a scientific experiment in which they evaluate three "Martian" soil samples and determine if any contain life.

This lesson explores the similarities between how a human being moves/walks and how a robot moves. This allows students to see the human body as a system, i.e., from the perspective of an engineer. It shows how movement results from (i) decision making, i.e., deciding to walk and move, and (ii) implementing the decision by conveying the decision to the muscle (human) or motor (robot).

Since at least the 1830s, New York working women endured low pay, long hours, and difficult working conditions. Concerned observers noted that some were even forced to turn to prostitution to supplement their meager incomes. During the Civil War, poor men flocked to the army (wealthier men could purchase substitutes for $300). The women left behind were now responsible for supporting families on their own. While wartime production created additional opportunities for women to work, it also led to even greater exploitation as factory owners pushed their workers to turn out more goods. Under these conditions, some women, such as this one, suggested that collective action might provide a solution.

This activity engages students in learning about ways to become energy efficient consumers. Students examine how different countries and regions around the world use energy over time, as reflected in night light levels. They then track their own energy use, identify ways to reduce their individual energy consumption, and explore how community choices impact the carbon footprint.

This lesson teaches the engineering method for testing wherein one variable is changed while the others are held constant. Students compare the performance of a single paper airplane design while changing the shape, size and position of flaps on the airplane. Students also learn about control surfaces on the tail and wings of an airplane.

Estimated Lesson Time: 55 minutes

Students will be able to:
-Experience cognitive biases through thought experiments
-Identify various cognitive biases
-Give examples of cognitive biases in your own life
-Explain what cognitive bias is and how it can impact our decision making

ANSWER KEY LINKS: Create a Next Gen Personal Finance (NGPF) account to access answer keys. They will be listed under the Full Year Curriculum tab.

This lesson is based on the results of a performance task in which we realized that students' understanding of area and perimeter was mostly procedural. Therefore the purpose of this re-engagement lesson was to address student misconceptions and deepen student understanding of area and perimeter. The standards addressed in this lesson involve finding perimeter and area of various shapes, finding the perimeter when given a fixed area, and using a formula in a practical context. Challenges for our students included decoding the language in the problem and proving their thinking. (7th Grade Math)

CESA #1 EL OER Project A visual guide to area and perimeter. Great for English Learners and students with special needs.

This Desmos activity allows students to explore the area of triangles with online geoboards.  This resource was helpful in understanding that a triangle is half of a square/rectangle.  Students were able to conceptualize why the formula for a triangle includes the "multiply by 1/2".  Students can work at their own pace and encourage math discourse.

In this lesson, students will engage in an informal derivation of the relationship between the circumference and area of a circle. This activity is linked to Standard 7.G.B.4. Students will use their understandings of the area of a rectangle to make sense of and informally derive the area formula of circle. This activity has students cut circles (paper plates) into sectors and recompose into a rectangle (approximately). This is a link from Geogebra that provides a great visual of this activity. https://www.geogebra.org/m/RUqSMrjn

This problem is part of a very rich tradition of problems looking to maximize the area enclosed by a shape with fixed perimeter. Only three shapes are considered here because the problem is difficult for more irregular shapes.