| Unit 4: The World Expands and Changes |
| Chapter 14: Technology and Expansion |
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| Health |
| This Month in Physics History - July 5, 1687: Publication of Sir Isaac Newton's Principia |
| The Principia included Newton's three laws of motion and showed how his principle of universal gravitation explained the motions of heavenly bodies and falling bodies on Earth. This article focuses on the development and publication of this body of text. |
| http://www.aps.org/apsnews/0700/070005.html |
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| Social Studies |
| How the U.S. Has Changed Over Time: Animated Map |
| This animation shows how the United States has changed over time. It begins in 1650 and moves through to 1983. |
| http://www.ac.wwu.edu/~stephan/Animation/us.gif |
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| Social Studies |
| Isaac Newton |
| This site gives an overview of Newton's life and works. The article categorizes his life's works, such as optics and lights, gravity, and more. |
| http://www.newgenevacenter.org/biography/newton2.htm |
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| Social Studies |
| Sir Isaac Newton: Scientist and Mathematician |
| This brief biography focuses on Newton's work and his influence on science and mathematics. |
| http://www.lucidcafe.com/library/95dec/newton.html |
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| Social Studies |
| UT Library Online: Perry-Castenada Library Map Collection |
| You can browse through this extensive collection of historical United States maps. In addition to the maps for each state, you can find early maps of U.S. territorial growth, early inhabitants, and more. |
| http://www.lib.utexas.edu/maps/united_states.html |
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