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End of Feudalism and Beginning of Commerce
Europe experienced radical economic and social changes between the 11th and 14th centuries. The medieval world was based on feudalism, a highly regulated and hierarchical form of society in which everyone had their place and responsibilities. The manorial system, in which lords owned the land worked by their vassals, or serfs, started to wane in the late Middle Ages with the development of nation-states. Medieval cities, dominated by the guilds that brought economic stability, became the centers
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The Pacemaker of the Heart
The pacemaker of the heart, a tiny area of specialized nervous tissue in the right atrium, sets the heart beating. The electrochemical impulse travels from the SA Node to the AV Node. The AV Node causes contraction of the ventricles. 
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Oxygen Transport
3-D animation shows the uptake of oxygen by the red blood cells at the alveoli. Shows how hemoglobin binds to the oxygen to transport it through the circulatory system to the tissues. Grades 7-12. 3:09 min.
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How a Virus Works
This narrated animation explains what a virus is and how it functions. It relates the way a virus works to nanotechnology. The human immune system fights an infection, like a virus, using various types of cells. The body has to adapt to infections and the dead cells are carried to the lymph nodes. 
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Sintaxis Grafica de la Multimedia (Graphical Syntax of Multimedia)
The multimedia offers an integration that must be made by the subject with the stimuli given, in their majority visual. For that reason it is interesting to know how effective may be the use of images and to propose some basic norms for designing multimedia software based on a graphic syntax
Author(s): Araya, N., Alvarado, R.G. and Gallador, N.A.

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Place Value to 100
In this video learn place value to 100.  Larry uses a whiteboard to show examples and explain the place value system and how it works.  More lessons can be found at: http://www.MathWithLarry.com

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Place value
Place value helps us determine the value of numbers and understand the relationships between digits and numbers and the number system.  The video looks at place value with whole numbers and decimal numbers and place value activities for students to do.

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1 of 7_COSMOS-Heaven and Hell
A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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2 of 7_COSMOS-Heaven and Hell
A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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3 of 7_COSMOS-Heaven and Hell
A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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4 of 7_COSMOS-Heaven and Hell
A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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5 of 7_COSMOS-Heaven and Hell
A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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7 of 7_COSMOS-Heaven and Hell
Cannot locate #6 in the series at this time. A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect. Then, Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes. For middle school and high school students.
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Scale of Planets and Stars
This short video (with no sound, just music) shows the scale of the planets in our Solar System as well as the scale of our Sun to other stars in the universe. Suitable for all ages.
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Solar System Slideshow
Take an eight-minute tour of our Solar System through this compilation of videos and images.
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The Solar System Tour
This video has very good images of the planets in our Solar System, including the plutoids at the end. (04:37)
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Scaling the Solar System
NASA Connect segment that explores how astronomers and scientists use astronomical units in measuring distances in the Solar System. (04:43)
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Planet, sun, star comparison
Animation that shows the planet, solar system and larger stars. This two minute video shows how large some of the stars are compared to Earth's sun. This is a good video for an introduction into astronomy, but lacks details outside of sizes.
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1 of 5 Complete Cosmos-Secrets of The Solar System
A journey through the Solar System. A documentary on the 8 planets of our Solar System (9 if you want to still count Pluto). Detailed descriptions of each of the planets including what each Planet is made of and other interesting facts. Suitable for older elementary, middle school, and high school students.
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2 of 5 Complete Cosmos-Secrets of The Solar System
A journey through the Solar System. A documentary on the 8 planets of our Solar System (9 if you want to still count Pluto). Detailed descriptions of each of the planets including what each Planet is made of and other interesting facts. Suitable for older elementary, middle school, and high school students.
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