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Torques and Gyroscopes
Why a spinning top doesn't topple. When a torque acts on a spinning object, the angular momentum changes, but the object only precesses. The object may be a child's toy, or a part of a navigation system, or Earth itself.
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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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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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The Great Stink - History of sewage - Thames River Water
Thames Water commissioned this short film mark the 150th anniversary of The Great Stink. In the hot summer of 1858, the stench of sewage in the River Thames so offended MPs that Parliament was suspended and the Government agreed to "take immediate measures for abating the dangerous nuisance caused by the noxious state of the Thames". A leading Victorian engineer, Sir Joseph Bazalgette, was commissioned to design and build a system of sewers which would remove the sewage from the Thames, sending
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Polio pt 1
Content: Poliomyelitis is a viral infection of the intestinal tract. Most cases of polio were mild--headache, fever, sore throat, and depression--with the patient usually recovered within three or four days. In fewer and more serious cases, the virus penetrates the stomach and intestinal tract, enters the lymphatic system, then the bloodstream, and then attacks the motor nerve cells of the spinal cord; if the nerve damage is severe, paralysis will result. Occurring most frequently in children, p
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Polio pt2
Poliomyelitis, also known as infantile paralysis, is a viral infection of the intestinal tract that sometimes can attack the central nervous system and lead to severe muscular paralysis. After the 1916 outbreak, the United States averaged 21,000 paralytic cases per year. During the 1930-40s, both private and government research was accelerated to try to find a cure for this dreaded disease. The National Foundation of Infantile Paralysis, now the March of Dimes, was inaugurated by Franklin D. Roo
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Hormones
Many of the body's most basic functions are regulated by the endocrine system—eight different glands located throughout the body. The endocrine system constantly and quietly does its work—secreting liquid chemical messengers called hormones. These chemicals manage muscle growth and digestion, as well as energy, reproduction, and more. This 3-D animation shows the hormones as they move through the body. Grades 7-12. 1:02 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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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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The Fate of Absorbed Nutrients
You've eaten a hamburger and it's broken down into your blood and lymph node system.  But where does it go now? Professor George Wolfe discusses the fate of absorbed nutrients in this video from Thinkwell's online Biology series. Run time 15:58.
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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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Systems of Equations - Substitution
A teacher narrates and explain how to solve two systems of equations and a problem involving approaching trains.  The narrator solves the system by substitution in several examples using a marker on a computer screen. 

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Solving Systems by Substitution - Math Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by substitution, by first isolating one of the variables in the system, then substituting its value for the corresponding variable in the other equation.
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Solving Systems by Graphing - Algebra Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by graphing. The first step is to graph each of the given equations, then find the point of intersection of the two lines, which is the solution to the system of equations. If the two lines are parallel, then the solution to the system is the null set. If the two given equations represent the same line, then the solution to the system is th
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Solving Systems of Equations by Substitution
The instructor uses a white board to demonstrate how to solve a system of equations by using the method of substitution.  In the video the teacher presents and solves a problem on substitution from a page in the math text on a white board. 

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Graphing Systems of Equations
This lesson explains how to solve a system of two equations by graphing.  The instructor begins by graphing the line for each equation.  Then he demonstrates how to find the point of intersection which is the solution for the system.

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