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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Learn to Measure things Using NonStandard Units
This musical video is about measurement using non standard unit. No narration in this video, just text instructions. Non standard unit is the glass that being used to measure 1 kg of flour.
A simple example is shown and then questions are asked about how  to find other items that can be measured in the same way.

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i and Imaginary Numbers
Introduction to i. Raising i to arbitrary exponents. Factoring quadratics. This video starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for older middle and high school students.
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Complex Numbers in Algebra, (Part 1)
Introduction to complex numbers. Adding, subtracting and multiplying complex numbers. This video starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for older middle and high school students.
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The US Constitution: Creating a New Form of Government
A very brief introduction into the Constitution.  A little silly, but it could hold the attention of some students. A lot of words need to be explained and the video clearly needs to be better organized. Best used if previewed and ancillary materials used. The moderators are a distraction.

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Reflexive Pronouns
This video is an introduction to reflexive pronouns.  The lesson presents examples of reflexive pronouns and gives the viewer an opportunity to try and select the correct reflexive pronouns to complete a sentence.

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It's Mine! Possessive Pronouns
This brief video explains possessive pronouns.  It gives examples of possessive pronouns and how to correctly use them.  Even though this video is short, it is a good review or introduction to possessive pronouns.

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This video explains what heteronyms are, these are words that are spelled the same, but pronounced differently. Â For examples, as a noun, dove is a type of bird. Â As a verb, dove is the past tense of dive. The difference usually comes because it is a different part of speech and the emphasis is on a different syllable. Â  Video is a great introduction or review of heteronyms.Â
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Waterproof Gecko is Unsinkable and Can Walk on Water
Two minute video shows geckos in/on the water. Excellent footage. Great for introduction into anmial unit. Perhaps a compare and contast with a lizard. Run time 02:28.
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Re- and Pre- Spelling Patterns
Introduction is almost 2 minutes long. Â A spelling list of Â pre- and re- prefix word practice. Â Narrators reads the entire list and the challenge words. Â Each word is spelled orally and individual letters appear on the screen. Â Narrator defines the word. Â Students are asked to trace and say the word. (18:
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In, On, Under, Over, In Front, Behind!
This short video from http://EnglishSongsDVD.com is a quick basic introduction to some prepositions.Â  It would be a good starting point for discussing prepositions, but the audio is very fast and it can be difficult to understand the singer's words.Â
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Prepositions of Direction, Part 3 of
This is part 3 of a lesson on prepositions of location and direction. The list of prepositions is long, so this is meant to be a review and not an introduction. Level: high beginner - intermediate. (8:26)
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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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Snippet from money video. Â Children learn why it is important to learn how to count money.Â  Children learn the names and value of pennies and nickels. Â Children are told coins are round and then shown a coin and told how much it is worth. Â  Â Introduction is 1 min. long. (3:36)

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Lesson on Measurement Using Non Standard Units
A lesson in a Grade one class where students measure objects with non-standard units.  The students measure various items in the classroom using non standard unit.  The students review measurement definitions with teacher.

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Compare, Order and Measure Length
Students will learn how to measure objects by counting unifix cubes (non-standard measurement), compare lengths of unifix cube trains and put trains in order. Â User clicks through the slides.Â

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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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Physical Geography - Forces that Shape Our Earth
Explore the major landforms of our world with spectacular video footage. Look at the various forces that affect our physical environment including glaciers, volcanoes, gravity, rivers, lakes and oceans, movement in the earth, wind and temperature changes. This video is a superb introduction to the ways all these forces work together to shape our planet.
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Time, Stonehenge and Sundials
A short video moving through the history of human attempts to measure and record time. Daniel Boorstin, author of "The Discoverers" commented that "The first grand discovery was time, the landscape of experience." This video is intended as an introduction to the three accompanying videos on designing and constructing sundials: The four videos in this series are "Time - 1", "Our Planet is a Clock - 2", "Sundials and Latitude - 3" and "Create a Sundial - 4"
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