Understanding Weight vs Mass
In everyday language, the words "mass" and "weight" are used interchangably but they really are different things when it comes to physics. Professor Steven Pollock explains weight in this video from Thinkwell's online Physics series. The video uses lecture format, demonstration, and a whiteboard to aid in the explanation.  Run time 09:16.
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Understanding Logical Statements, Part 5 of 5
In a conversational tone, Sal Khan offers an ending commentary to his series about mathematical logic statements. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. (03:28)
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Understanding Logical Statements, Part 1 of 5
"Identify the hypothesis and conclusion of the following statement, and determine whether the statement is always, sometimes, or never true." In this video, Sal Khan offers an introduction to understanding mathematical logic statements. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. (03:53)
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Understanding Logical Statements, Part 2 of 5
Sal Khan continues his discussion using the same statement as the last video in this series, but adds a different logic problem to solve: "Identify the hypothesis and conclusion of the following statement, and determine whether the statement is always, sometimes, or never true." In this video, Sal offers an introduction to understanding mathematical logic statements. Sal uses the Paint Program (with different colors) to illustrate his points. (06:43)
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Understanding Logical Statements, Part 3 of 5
"Determine whether the statement is always, sometimes, or never true, and explain why." Sal Khan takes a mathematical statement and helps the viewer make sense out it. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. (03:12)
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Understanding Logical Statements, Part 4 of 5
"Determine whether the statement is always, sometimes, or never true, and explain why." Sal Khan continues with this logic statement and works step-by-step through it. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. (01:49)
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Understanding Decimal Place Value
This short video is from Jimmy Chang, who has a master's degree in math and has been a math teacher at St. Pete College for more than eight years.  He explains decimal place value.
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Understanding HTML Tags, Part 1
Helps you to understand what the different tags stand for so you can code or edit in HLML.  Always need to start with an opening tag.(6:50)
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Understanding Memory
Our brains remember things by association. Cognitive science studies memory. Memories may be improved via repetition - which strengthens neural connections.
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Left Hand Velocity Stroke on a Marching Snare Drum
Left Hand Velocity Stroke on a Marching Snare Drum. Part of the series: How to Play the Snare Drum. Perform the left hand velocity stroke when playing the marching snare drums. This was used to help soldiers keep their marching beat during war. (01:27)
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Understanding the Brain: Development
A baby's environment plays just as large a role in
its development as its genes. Very short video. Basically, a brief introduction.

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Classifying Triangles
This lesson defines and shows examples of various types of triangles: scalene, isosceles, equilateral, acute, obtuse, right, and equiangular.

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LL Teach's Discovery Templates and Communicator Clearboard activity for building better understanding of quadrilaterals.
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Understanding Tone
This video concerning the tone of a story is by a college professor, however, the information presented by the instructor will be readily understood by middle and high school students. Instructor: Assistant Professor Adam Crowley, Husson University.
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Understanding the Comma
This lesson opens with a brief introduction to the history of punctuation. Seven basic rules for using the comma correctly are presented and explained through humorous examples and illustrations. The original song, "Throw a Comma Down,"completes the lesson and reviews the seven rules. (03:23)
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Understanding Heart Disease -
Heart disease affects more than 20 million Americans. This video has a doctor explaining the various forms that heart disease can take. Animated diagrams are used to illustrate important points. (2:55)
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Hypertension and Stroke
Hypertension is one of the leading causes of stroke, but there are ways to reduce your risk. In this video a doctor explains what hypertension is and why it is important to keep under control.  1:03 min.
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Understanding High Blood Pressure
A quarter of Americans have high blood pressure, or hypertension. In this video, a doctor uses diagrams to explain what high blood pressure means, why it is of concern to your health, and how it is diagnosed.  3:09 min.
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What is a stroke?
An enormous amount of information about stroke types, stroke symptoms, and other educational information about strokes. A doctor and professor of neurology talks about what a stroke is, why a stroke happens, the symptoms, and how it affects people.  (3:14)

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Understanding Stroke
Every 45 minutes in America, someone has a stroke…often for the second or third time. This video explores what happens during a “brain attack.”  3:13 min.
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