What Are the First Symptoms of HIV?
The first symptoms of HIV will mimic a cold-like experience, including fever, fatigue, headaches and sometimes a rash. Find out why HIV may be difficult for a physician to initially diagnose.
Intertidal Zone
This video segment from NOVA: "The Sea Behind the Dunes" explores the often-overlooked ecosystem of the salt marsh, focusing on the plants that provide both a physical structure for the community and the building blocks for the detrital food chain that exists there. Closed captioning included. Run time 04:52.
Light Source in Watercolor Painting
These are very short clips.) How to consider the light source and how it affects objects in your watercolor painting by Larry Dubitsky. A thin brush is a great detail brush. English captions. (1:05)
Indefinite and Definite Articles
An article is a word that combines with a noun to indicate the type ofreference being made by the noun. The three main articles in the Englishlanguage are the, an and a. Teacher, Santha A. Kumar, explains  the articles with examples on the whiteboard. (4:47)
Parallel and Perpendicular Lines
This video clip explains how to find the equation of a line when given an equation of a line that is parallel or perpendicular to it. Parallel and perpendicular lines have related slopes. Parallel lines have equivalent slopes and perpendicular lines have negative inverses of their slopes. To fully understand and apply this concept, we should be familiar with the slope and the slope-intercept form of an equation. (2:38)
The Tempest (la tempestad) by William Shakespeare
This is a music video made with some picks from the play The Tempest, by William Shakespeare. The play was performed by students of Ortzai Theatre Laboratory.
The Longbow, Part 7 of 11
Some scholars claim that the longbow 'made' Britain.This documentary explores the technology of the longbow. Suitable for high school students.
The Longbow, Part 8 of 11
Some scholars claim that the longbow 'made' Britain.This documentary explores the technology of the longbow. Suitable for high school students.
The Longbow, Part 9 of 12
Some scholars claim that the longbow 'made' Britain.This documentary explores the technology of the longbow. Suitable for high school students.
How to Convert a Recurring Decimal Into a Fraction
In order to convert a recurring decimal into a fraction, understand that 1/3 is equal to .333 repeating. Find out how to use a bar to denote a recurring decimal with help from a tutor in this free video on math lessons and study tips.
Multiplying Rational Expressions
Algebra video on how to multiply rational expressions. Run time 03:02
CPCTC
CPCTC is an acronym for corresponding parts of congruent triangles are congruent. CPCTC is commonly used at or near the end of a proof which asks the student to show that two angles or two sides are congruent. It means that once two triangles are proven to be congruent, then the three pairs of sides that correspond must be congruent and the three pairs of angles that correspond must be congruent. (2:35)
Squeeze Theorem
Mr. Khan offers this video of the intuition (but not a proof) of the Squeeze Theorem. Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (07:37)
Algebra Word Problems - Math Help
In this video, which is for middle school students and older, the instructor uses a white board to demonstrate. Students learn to solve "number" word problems, such as the following. One number is four times as large as another. The sum of the numbers is 45. Find the numbers. Since the first sentence states that one number is 4 times as large as another, the numbers can be represented as x and 4x. Since the second sentence states that the sum of the numbers is 45, the equation can be set up as x
Solving Math Word Problems
In this video a math teacher explains that when attempting to solve math word problems, it's helpful to tackle the problem one word at a time. Examples are explained and solved of how to translate word problems into math functions, such as "less than" implying a subtraction.
100 Greatest People - Friedrich Nietzsche - 01/04 Nietzsche was not at all what people thought he was. Nietzsche has had a bad name since Hitler came to power, embraced his philosophy and used at a foundation and justification for Nazism and the superiority of the Arian race. In truth, Nietzsche would have been appalled by Hitler the beliefs and practices of the Nazi regime were distortions of his teachings or in some cases the direct opposite of what he ta
Democracy: An Overview
This 10 minute video is an overview of what democracy is - Shared Respect & Shared Power - and what makes it work. This 60 year old educational film deals with the same issues and responsibilities that exist today. Signs of Democracy is a good lesson to use as a starting point in this film and for additional discussions.
Colors for Beginning Learners
The video deals with colors. The video doesn't do the colors in the order of the spectrum, but that shouldn't matter to beginning learners. The instructor says the colors to match the Rainbow Song. The video may have been helped by adding the words of the colors. Suitable for pre-school learners.
Learning About the Letter "t" - Mr. T Has Tall Teeth - The Letter People
This is a part of "The Letter People" and focuses on "Mr. T", who has "tall teeth". The sound of letter 't' is reinforced through music and simple skits. Puppet characters act out the skits. Opening credits take about 20 seconds. (03:31)
Letter "T" Dance Song
Elmo and the kids take part in a letter "T" dance in this video. They practice the sound that "T" makes and "twist" and "turn" as they dance. (1:22)
