This video segment adapted from NOVA shows how scientists use the fossil record to trace when early human ancestors and related species began walking on two legs instead of four, and to determine whether they were more apelike or human in appearance.

This chapter introduction describes the historical context in which the issue of federalism was discussed by our nation's Founders. Discusses the Federalist and Anti-Federalist points-of-view.

This video segment from The Supreme Court introduces viewers to the 14th amendment.

In this interactive tutorial, learn and practice adding, subtracting, multiplying, dividing, and converting fractions.

Lessons include: (1) Introduction to Fractions. Get an introduction to fractions. (2) Comparing and Reducing Fractions. Learn how to compare and reduce fractions. (3) Adding and Subtracting Fractions. Learn how to add and subtract fractions. (4) Multiplying and Dividing Fractions. Learn how to multiply and divide fractions. (5) Converting Percentages, Decimals, and Fractions. Learn how to convert decimals, percentages, and fractions.

Video tutorial explores how to graph and locate fractions on a number line. [4:15]

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.

Papa and his son Pierre work at a grape farm. Pierre loves to go out and play as soon as the sun comes up. What do you know about the sun and the Earth?

This lesson in high school physics on Newton's Second Law of Motion provides a discussion of free fall and air resistance, and answers, "Why do objects which encounter air resistance ultimately reach a terminal velocity?" and "In situations in which there is air resistance, why do more massive objects fall faster than less massive objects?"

In this lesson and activity booklet, students will learn about the Underground Railroad, conductors, and routes to freedom taken by Freedom Seekers.

In this tutorial, learn what freelance work is and why it's becoming a more common career path for many professionals.

Lessons include: (1) What is the Gig Economy?. Learn all about the gig economy and its impact on today's workforce. (2) The Pros and Cons of Freelance Work. Discover the advantages and disadvantages of freelance work. (3) What is a Temp Job?. Learn the advantages and disadvantages of working a temp job. (4) What is a Temp Agency?. Learn how temp agencies work.

Working as a freelancer and striving to build a successful business could lead to a much more satisfying work life. With the right plan, you can work for yourself and earn a living. This tutorial includes curated videos of freelancers sharing their tips and experiences.

Lessons include: (1) What is Freelancing?. Freelancing is a form of self-employment. As a freelancer, you don't work exclusively for any specific company. This gives you the freedom to live anywhere with reliable internet connection. (2) Temporary Freelancing. The gig economy provides flexibility when people need it most. For example, temporary positions, contract work, and other types of freelancing are excellent options for people who have lost their jobs or are in between jobs. (3) Time is Money. As a freelancer, you’ll need to learn how to make the best use of your time. The faster and more efficiently you work, the more money you'll make. (4) Picking Your Services. If you’re ready to choose which freelance services you’d like to offer to potential clients, here are some important ideas and concepts to help you decide. (5) Freelance Pricing. Setting your price as a freelancer requires that you understand the value of your services. You also need to know your target customers and competitors. After all, you don't want to set your rates too low and undersell yourself or too high you lose potential projects to competitors. (6) Finding Customers. When you're self-employed as a freelancer, you need to figure out how to stand out from the competition. Branding is what makes certain companies stand out, while others fail to connect. (7) Social Media. Market research will also inform which social media platforms you choose to promote your work on because you'll know where your customers are online. (8) Customer Service. Part of great customer service is being there when your customers need you. Being active on social media ensures you're easily found online. Make sure to fill out all of your social media profiles and include links to your other platforms on each. (9) Taxes as a Freelancer. Freelancing is a business. Like any business, you need to pay taxes. Depending on how you register your business, you might not need a business license. Your social security number is your license if you are a sole proprietor. (10) Freelancing Platforms. A freelancing platform is an excellent option for people starting in self-employment. Many of them require you to apply so it's a good idea to have a portfolio of work, resume, and biography or statement ready. (11) Your First To-Dos. In this section, you'll find a to-do list, a Google Sheets spreadsheet template to track keywords, competitors, finances, and more. We also provided a list of handy resource links. (12) Resources. We want to leave you with some freelance resources to get you started. (13) Freelancing Quiz. Take the quiz to see how much you've learned about freelancing!

This tenth grade annotated inquiry leads students through an investigation of the French Revolution. Adolescent students are quite concerned with challenging authority and establishing their independence within the world; the concept of revolution brings those two concerns to their most world-altering levels. This inquiry gives students an entry point into thinking like historians about the French Revolution. The question of success invites students into the intellectual space that historians occupy. By investigating the question of the French Revolution’s success, students will need to make decisions about what the problems of the Revolution were, how to give weight to the events of three different periods of the Revolution, and what distance, if any, was between intentions and effects.

In 1845 Frederick Douglass published what was to be the first of his three autobiographies: the Narrative of the Life of Frederick Douglass, an American Slave, Written by Himself.  As the title suggests, Douglass wished not only to highlight the irony that a land founded on freedom would permit slavery to exist within its midst, but also to establish that he, an American slave with no formal education, was the sole author of the work.

In the years after World War I Americans quickly reached the conclusion that their country's participation in that war had been a disastrous mistake, one which should never be repeated again. During the 1920s and 1930s"”recognized as the Interwar Period (1921-1939)"”U.S. officials pursued a number of strategies aimed at preventing war.

From Now On explains the purpose and advantages of graphic organizers such as converting complex information into meaningful displays, helping students plan their research, and sometimes acting as mind maps. There are several examples provided using both fiction and nonfiction.

This brief article addresses many of the issues facing the country after World War I. It provides an ovierview of the Republican policies which supported private business.

This resource gives a comprehensive account of the Intolerable Acts, why they were passed, colonists' reactions, and particulars surrounding the Massachusetts Government Act and other Coercive Acts with text links and references.

Reasons for the Sugar Act and the Stamp Act are briefly described. The article also describes the colonial assemblies' reasons for fearing and speaking out against these taxes. The biggest question, Parliament's right to tax the colonies, is also discussed.

In this video excerpt from NOVA, find out how the discovery of a gene defect has led to the development of a new drug to treat patients with cystic fibrosis.

This video segment describes the basics of the circulatory system: how the heart pumps the blood that carries oxygen and nutrients throughout the body. [3:14]

This From the Top at Carnegie Hall video features a performance by 16-year-old Joshua Jones on the marimba. [4:29]