Introduction to Fractions
This lesson is a brief overview of fractions.Â  First, it tells that fractions can represent part of a whole or part of a set.Â  The lesson is a PowerPoint presentation and provides different illustrations of various fractions.

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Introduction to Decimals Part II
This video reviews how to say and write decimals when given a fraction. Additional examples are done. Then the video moves on to fractions that do not have a denominator that is not a 10, 100, 1000, etc. They show how to divide a fraction, thus converting to a decimal. Another example is done. Video is good quality and good for all students as a review or initial learning of the topic.
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Introduction to Symmetry
Introductory lesson concerningÂ symmetry.Â  Instructor Larry explains the general idea of symmetry and gives examples with letters in this clip. Instructor uses computer software for demonstration.
run time 3:41

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Introduction to Cellular Respiration
The instructor uses software (and several colors for clarification)Â to offer an introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain.
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Amusing introduction to hydrogen
An amusing introduction to the properties of hydrogen.Â Â Illustrates that hydrogen is lighter than air, with a balloon.Â  A wild-haired professor discusses the element, that it's part of water, and introduces the notion ofÂ deuterium.Â  Finally, the hydogen balloon isÂ exploded with some fire.Â  Part of the Periodic Table of Videos series; periodicvideos.com.
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Amusing introduction to helium
This introduction to the element helium covers its main uses and properties such as being used to fill up small helium balloons and huge helium blimps like the Goodyear blimp, that it cannot be synthesized but can be found naturally, that it is inert and not flammable, etc.Â  Combines amusing demonstrations with talking to the camera by a wild-haired chemistry professor.Â  Part of a series called Periodic Table of Videos.
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Amusing introduction to beryllium
This introduction to the element beryllium (atomicÂ number 4)Â covers its main uses and properties.Â  It is very toxic, invisible toÂ x-rays, expensive, and used in some high-tech equipment.Â Â Those working with beryllium are advised not to lick their fingers.Â  Combines amusing demonstrations with talking to the camera by a wild-haired chemistry professor.Â  Part of a series called Author(s): No creator set

Earthquake Country, Introduction
There are other segments of this series on WatchKnow. This is the introductory series to 'Earthquake' country which is suitable for middle school and high school students. Through live-action demonstrations and vivid animations, Dr. Pat Abbott explains how earthquakes have shaped the scenery and the character of the greater Los Angeles area. Dr. Abbott shows how faults capable of large earthquakes lie beneath most of the area, posing great risk to the millions of people living in earthquake coun
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An Introduction to Natural Gas
Until recently, most natural gas in Canada came from what are referred to as "conventional" sources -- with the gas trapped under relatively high pressure in relatively loose formations which allowed the gas to move freely to the wellhead for production.

In recent years, however, production of natural gas from conventional sources here in Canada has fallen, despite record levels of drilling and completion. With demand for natural gas continuing to grow, additional sources of natura

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Introduction to Nanochemistry
Introduction to nanochemistry and why it is important to scientists today. Discusses both the positive and negative impacts of nanotechnology. Good demonstrations. Grades 9-12. 2:59 min.
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Introduction to Kinetics
This video offers instruction from Sal Khan on kinetics, activation energy, activated complex, and catalysts. Suitable for high school chemistry students.
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Introduction to Work and Energy
Introduction to work and energy. 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 09:18.
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Vectors introduction
Find out what vectors are and how to add them graphically.
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Introduction to Motion
Introduction to basic physics of motion. Introduces the concept of variable velocity/acceleration. This video, which is suitable for high school students, starts with a black screen because the instructor uses it as a 'chalkboard.'
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Introduction to Motion (Part 2)
More on how velocity, distance, acceleration, and time relate to each other. Introduction to basic physics of motion. This video, which is suitable for high school students, starts with a black screen because the instructor uses it as a 'chalkboard.'
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Introduction to Motion (Part 3)
Using the basic equations of distance and velocity to solve motion problems, this video, which is suitable for high school students, starts with a black screen because the instructor uses it as a 'chalkboard.
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Introduction to Waves
In this video, the instructor offers an introduction to transverse and longitudinal waves. In an easy-to-understand, straightfoward manner the instructor explains while using computer software. Because the instructor writes on a dark screen, the viewer may want to open this video to 'full screen'.
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Introduction to the Mechanical Universe
Provocative questions begin the quest ofÂ The Mechanical Universe. This introductory preview enters an Aristotelian world in conflict, introduces the revolutionary ideas and heroes from Copernicus through Newton, and, like a space shuttle from past to present, links the physics of the heavens to the physics of the Earth.
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Introduction to Magnetism
An introduction to magnetism. This video, starts with a black screen because the instructor, in his conversational tone, uses it as a 'chalkboard.' Instructor uses different colors for clarification.
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Introduction to DNA
In this video, Sal Khan, offers anÂ overview ofÂ DNA.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education.
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