Types of Triangles, Area, Perimeter
This is a short educational video for grades 3-5. Types of triangles by length- equilateral, isosceles, scalene. Types of triangles by angle: acute, right, obtuse. How to calculate perimeter and area of a triangle. (04:15)
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ABC Video: Write the Letter A - Alphabet Writing Lesson for Children
The Singing Walrus presents this ABC video from our Alphabet Writing Series, "Write the letter A", an easy and fun video lesson for young children. Children learn how to write the letter A, both the capital A and the lower case a, through simple step-by-step instructions. Each letter is written three times to help the children memorize. Children who have seen our other videos will recognize the characters! (02:15)

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Say what you see
Try describing this picture.Â  If you are just beginning, try finding nouns to name the different items you see in the picture?Â  How about some adjectives?Â  Do you know […]

An immediate consequence of the viscoelasticity of polymers is that their deformations under stress are time dependent. If the imposed mechanical stress is held constant then the resultant strain will increase with time, i.e. the polymer creeps. If a constant deformation is imposed then the induced stress will relax with time (stress relaxation). Author(s): The Open University

In order to learn you need to follow the argument as you read. With an important text, you should slow right down and take it bit by bit. Here is a student describing how he tackled a particularly challenging chapter:

This intensive kind of reading is at the oppo
Author(s): The Open University

15.097 Prediction: Machine Learning and Statistics (MIT)
Prediction is at the heart of almost every scientific discipline, and the study of generalization (that is, prediction) from data is the central topic of machine learning and statistics, and more generally, data mining. Machine learning and statistical methods are used throughout the scientific world for their use in handling the "information overload" that characterizes our current digital age. Machine learning developed from the artificial intelligence community, mainly within the la
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â€˜The whole is more than the sum of its partsâ€™ is a good place to start thinking about systems. A car is more than its individual components. We can think of a football team as being more than a collection of individual players or a family being more than a group of people who share the same name.

Each of these examples â€“ the car, the football team and the family â€“ can be seen as systems. Individual parts of a system are connected together in some way for a purpose.

Example
Author(s): The Open University

Engineering An Empire - The Aztecs - part 5
'Aztec is a term used to refer to certain ethnic groups of central Mexico, particularly those groups who spoke the Nahuatl language and who achieved political and military dominance over large parts of Mesoamerica in the 14th, 15th and 16th centuries...' (Aztec, Wikipedia, 2009). This History Channel documentary is suitable for older middle and high school students and is narrated by various scholars.
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Dissention in the Bay Colony
In the Puritan world view, everything worked according to a plan set by God, and an orderly society of people worked and lived out that plan. The Massachusetts Bay Colony was a tight-knit group, founded on the ideal of being a harmonious community of people who agreed to work together and abide by the wishes of the larger community.
Puritan theology gave weight to the idea that if people allowed Godâ€™s will to rule and guide the community, peace, harmony and prosperity would follow. If t

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You may have met the term bit, perhaps in connection with computers. The term 'bit' is also important in communication systems. It is an abbreviation for 'binary digit'. A binary digit can have just one of two values: it can be either 1 or 0. Pulses can be represented by 1s and 0s, that is, as bits, and so it is convenient to think of streams of 1s and 0s being conveyed along the communications link.

The rate at which the 1s and 0s are conveyed is known as the data rate or
Author(s): The Open University

Fluoride ions (Fâˆ’) are rare in foods, though some are found in tea and in seafood. However, fluoride does occur naturally in some water supplies, derived from the rocks through which the water flows. Its only role in the body appears to be to help to protect teeth from decay.

The stages of tooth decay are as follows:

• bacteria live in saliva on teeth (form plaque)

• produce lactic acid â†’ dissolves calcium salts in tooth
Author(s): The Open University

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The European Parliament fulfils three main functions:

• it shares the power to legislate

• it exercises democratic supervision over all EC institutions

• it shares authority over the EC budget.

The legislative and supervisory roles are based on the European Parliament's democratic legitimacy. Its members are directly elected every five years by the citizens of the EU member states.

Author(s): The Open University

Tracie McMillan on the â€˜American Way of Eatingâ€™
To report on food sourcing and access in the United States, author Tracie McMillan went undercover, picking garlic in the fields in California and working at a Walmart in Michigan and an Applebee's in New York. She published a book about what she learned from these experiences called The American Way of Eating. Knowledge@Wharton recently spoke with McMillan about how income level affects food consumption, who controls the food we eat and why the food system might be transformed if peopl
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A focus group is simply a group of people gathered together to discuss a particular issue. They have been used in all kinds of social and market research, including political policy making. In market research for product design, a focus group might be a group of purchasers of a particular product brought together to discuss their feelings and attitudes towards the product and rival products; or perhaps their general likes and dislikes about those types of products. The intention of the market
Author(s): The Open University