Calculus - Introduction to Limits
In his easy, conversational tone, Mr. Khan offers an introduction to the intuition behind limits.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. (07:37)
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Introduction to Volume
This animation, from the Pilot Math Essentials 10 series, explains the concept of Volume when the Pilot characters decide to throw a hot tub birthday party for Lian.
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Ancient Olympic Boxing - An Introduction
A slickly-produced video about ancient Greek boxing, but no demonstrations--just (fancy) text on screen. Boxing was first accepted as an Olympic sport in 688 BC, being called Pygme or Pygmachia. Participants trained on punching bags (called a korykos). Fighters wore leather straps (called himantes) over their hands, wrists, and sometimes breast, to protect them from injury. The straps left their fingers free. Legend had it that the Spartans were the first to box as a way to prepare for sword and
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National Board of Professional Teaching Standards Introduction
A ten minute video that explains the purpose of the program and what it entails. This is a general video with few specifics.

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Our Flowering World - and Introduction to Flowers
Links to electromagnetic waves video instead of video about how flowers come in many shapes and sizes, and that they play a vital role in the natural world. Their purpose is reproduction. (1:22)
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Introduction to Word Problem Terms
This is an introduction to basic word problem terms.  Larry discusses key words that are usually associated with a particular mathamatical operation. Terms are shown for addition, subtraction, multiplication, and division.

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Song: Coin Counting Introduction
An introduction to U.S. coins and their value in cents along with counting byones, fives, tens, and twenty fives.
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An informal introduction to why we need to learn about fractions, with examples from sports, food, etc.Â  This is the introduction to a longer lesson (Lesson 6) consists of a general tutorial about fractions. NOTE: the use of printed notes is integrated with the video (although not this introductory segment of the video).Â  Just the teacher in front of a whiteboard, with some silly introductory stuff.Â  The actual content begins around 1:45.

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Math Made Easy: Introduction to Fractions (Part 1)
In this video, the viewer is introduced to fractions and shows how to find the numerator and denominator. For third-grade students and older.
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Math Made Easy: Introduction to Fractions (Part 2)
In this video,Â the instructor doesÂ a couple of exampleÂ problems to show how to identify the denominator and numerator. For third-graders and older.
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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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