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Emazine: The "Gilded Age" in the United States
This article from a wider history of the world focuses on presidential administrations from Benjamin Harrison in 1890 through the Wilson administration. Read about the domestic policies and foreign affairs from 1890-1920.
Gilder Lehrman Institute of American History
Gilder Lehrman Institute: History Now: Politics of Reform
[Free Registration/Login Required] A great look at the Progressive Era, the issues dealt with at that time, and the legistlation passed to help alleviate social ills. Read about the great range of personalities and viewpoints that drove...
Internet Encyclopedia of Philosophy
Internet Encyclopedia of Philosophy: Immanuel Kant (1724 1804)
A very in-depth look at the philosophical ideas of Immanuel Kant on subjects such as ethics, rationalism, and much more.
Khan Academy
Khan Academy: Ap Us History History Unit: Period 7: 1890 1945: Teddy Roosevelt
The study resource from Khan Academy provides an overview of Period 7: 1890-1945 in American History. The Presidency of Theodore Roosevelt is discussed in this lesson. This resource is designed as a review for the AP US History Test.
Khan Academy
Khan Academy: Ap Us History Unit: Period 7: 1890 1945: The Progressive Era
The study resource from Khan Academy provides an overview of Period 7: 1890-1945: The Progressive Era. An overview of an Progressive Era is provided. This resource is designed as a review for the AP US History Test.
Texas Instruments
Texas Instruments: Composing Music Mathematically
This activity is designed to motivate and challenge first year algebra students through a fun introduction to advanced mathematical concepts. It also offers extensions for upper grade level students. Students will recognize relationships...
Texas Instruments
Texas Instruments: Gas Lab
Students determine the molecular weight of a pure gas in a balloon by using gas laws and trapping the gas in a glass bottle. Students watch the instructor demonstrate the lab on day one. On day two and three they practice the lab. On day...
Science Buddies
Science Buddies: Chain Reaction: Inversion and the Pappus Chain Theorem
Here is a challenging problem for anyone with an interest in geometry. This project requires background research to solve it, but it is an excellent illustration of visual thinking in mathematics.
Digital History
Digital History: Robber Baron or Industrial Statesman [Pdf]
John D. Rockefeller was a controversial figure in the business world of the 19th century. Read about his actions to consolidate his control of the oil refining business in all its aspects. Find arguments claiming that he was an...
Texas Instruments
Texas Instruments: Matter
This Study Card stack enables students to review the concepts of matter, the kinds and classes of mater including atoms, molecules, elements, compounds, pure substance, and mixtures.
Science Buddies
Science Buddies: Beats
Systematically explore different frequency combinations in this experiment provided by Science Buddies. You will use your computer to create sound files to play pure tones on your computer, one frequency in the left channel, and another...
Science Education Resource Center at Carleton College
Serc: Conductivity of Water
Students discover that pure water does not conduct electricity and that dissolving different substances in water may or may not cause it to conduct electricity.
Science Education Resource Center at Carleton College
Serc: Bot Ec: Weight of Gold
Let's suppose that you have a shoe box full of water (the box is waterproof, of course). The shoe box weighs about 9 kg (19.8 pounds). Suppose you emptied the box and filled it completely with rock (little or no air space). How much...
TED Talks
Ted: Ted Ed: The Psychology Behind Irrational Decisions
Often people make decisions that are not "rational" from a purely economical point of view. Sara Garofalo explains heuristics, problem-solving approaches based on previous experience and intuition rather than analysis. [4:39]
Climate Literacy
Clean: Automotive Emissions and the Greenhouse Effect
This is a laboratory activity in which students will compare the amount of carbon dioxide in four different sources of gas and determine the carbon dioxide contribution from automobiles. They test ambient air, human exhalation,...
National Institutes of Health
Niehs: Kids' Pages: Water, the Never Ending Story
Online children's story that teaches about the importance of keeping water clean. Click on "next" at the bottom of the story to discover why having pure water affects the way we live and learn.
TeachEngineering
Teach Engineering: Navigating by the Numbers
In this lesson plan, students will learn that math is important in navigation and engineering. Ancient land and sea navigators started with the most basic of navigation equations (Speed x Time = Distance). Today, navigational satellites...
Wonderville Media
Wonderville: Fruits
Any fruit or 100% fruit juice counts as part of the Fruit Group. Fruits may be fresh, canned, frozen, or dried, and may be whole, cut-up, or pureed. Learn more about Fruits in this well-constructed overview by Wonderville.
Blackdog Media
Classic Reader: The Face and the Mask by Robert Barr
This is the full text of the short story collection The Face And The Mask by Robert Barr. Twenty-four short stories are collected in this volume. Mr. Barr is considered "A pure humorist."
Physics Classroom
The Physics Classroom: Vectors and Projectiles: Projectile Simulator
Students explore a variety of variables associated with the trajectory of a projectile including the launch height, angle, and speed. This interactive can be used as a purely exploratory activity or be used with an activity sheet that...
Physics Aviary
Physics Aviary: Magnetic Induction Lab
This lab was designed to have students test the things that can induce a current in a coil of wires. This lab is a purely quantitative lab.
Physics Classroom
The Physics Classroom: Motion and Forces in Two Dimensions: Vector Addition
In this physics tutorial, the task of summing vectors will be extended to cases in which the vectors are directed in directions other than purely vertical and horizontal.
Council for Economic Education
Econ Ed Link: Guess Who's Coming to Dinner
This lesson introduces regulation and information as two tools used by government to promote fair competition and complete information in a market economy. Using the 1906 Pure Food and Drugs Act as a case study, students explore the...
PBS
Pbs Learning Media: Understanding Indicative Mood
Verbal moods indicate a state of being or reality. There are several types: indicative, the most common where the state of being is pure fact; interrogative, which asks a question; and imperative, which is a command. It is important to...
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