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Matrices to Solve a System of Equations
This video from Khan Academy starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for high school students. Video shows how to use the inverse of a matrix to solve a system of equations.
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Tension in an Accelerating System and Pie in the Face
The second part to the complicated problem. We figure out the tension in the wire connecting the two masses. Then we figure our how much we need to accelerate a pie for it to safely reach a man's face. This video, which is suitable for high school students, starts with a black screen because the instructor, in his conversational tone, uses it as a 'chalkboard.' Instructor uses different colors for clarification. Run time 09:28.
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Hinduism: The Caste System
This is the third part of the interview to Dr. Davis. He refers to the Caste system in Hinduism. He also talks about the Cycles of time and Hindu Temples.
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The Urinary System
The urinary system is concerned with the formation and elimination of urine. In an adult, more than 2,500 pints of blood passes through the kidneys each day. Blood enters via the renal arteries and is filtered to remove most of the waste products of metabolism. Seven pints of filtrate are produced every hour. Purified blood returns to the body circulation via the renal veins. The filtering process is carried out by more than two million tiny kidney units, or nephrons, which produce a highly conc
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Urinary System
Segment from the program Digestion and Excretion: Absorption, Exretion, and Homeostasis.
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The Excretory System
This short, humorous video explains the excretory system (also called the urinary system), including its major organs: the kidneys, ureters, urethra, and bladder.
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National Wildlife Refuge System
This short animated video uses a cartoon Teddy Roosevelt to give a brief introduction about the over 500 wildlife refuges (Running Time 3:00).
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Endocrine System: How It Works
This video animation gives a basic overview of the endocrine system and the major glands. Explains how hormones target receptors on cells. Grades 7-12. 2:26 min.
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The Endocrine System
Professor George Wolfe discusses the endocrine system in this video from Thinkwell's online Biology series. The video uses lecture format along with notes and illustrations on a white board. Run time 10:04.
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Circulatory System
This is a simple but effective animation about how the heart works. Suitable for all grades. (Discaimer: A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "noncommercial use only, provided you include all applicable notices and disclaimers.) (2:58)
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Circulatory System and the Heart
In this video, the instructor demonstrates and offers an introduction to the circulatory system and the heart. The instructor uses computer software (and different colors for clarification) for demonstration.
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Circulatory System Structure
3-D animation shows the basic parts of the systemic circulatory system and how blood cells travel through the system. Grades 4-12. 1:08 min.
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Digestive System Animation
The digestive system provides us with the energy we need, by helping us process the food we intake.  This video examines the flow of food through our system.  
 
 

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Digestive System - What Happens to the Food We Eat?
This is a brief video in which the narrator gives a clear description of the digestive system. The narration is accompanied by still images.
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Lymphatic System
This is an introduction to the Lymphatic System and its role within the Circulatory System.  The lymphatic system restores vital fluid to the blood and plays a vital roll in disease resistance.
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How the Body Works : The Lymphatic System
This video, through still images and narration, offers information concerning the lymphatic system, a network of vessels which carries lymph from around the tissues to the blood.
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How the Body Works : The Digestive System
Starting at the mouth, the digestive system helps provide the energy your body needs to perform its many functions. This video is an overview of the digestive system with still images and narration.
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Muscular System
This excellent video, which is suitable for elementary-age children, discusses the human muscular system (a system with over 600 muscles) and was completed for 360Kid productions in Boston, MA. (Note: the slang word 'pee' is mentioned once in the video.)
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HUMAN BODY - Upper Muscular System (Arms, Hands, Fingers, Abdomen)
This video consists of still images only. Images have parts of the body labeled. There is no narration, just music. (02:54)
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The Real Number System
This animation, from the Pilot Math Principles 10 series, has the Pilot computer, Ed, explain the concept of Irrational Numbers, Number Sets, and the Subsets within.  A Venn Diagram is used to model these numbers.

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