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3.3 The projective plane

We now consider one of the most important non-orientable surfaces – the projective plane (sometimes called the real projective plane). In Section 2 we introduced it as the surface obtained from a rectangle by identifying each pair of opposite edges in opposite directions, as shown in
Author(s): The Open University

4.3.2 Stage 2: Embryonic ocean basin formation (southern Red Sea stage)

If extension and rifting progresses sufficiently, this will lead to the development of an embryonic ocean along the site of the earlier rift zone (see Figure 6b). Prior to true oceanic lithosphere being produced, basaltic magma will be repeatedly intruded into the continental lithosphere along fractures and shear
Author(s): The Open University

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Personification (Mr. Plant, How are You?)
Short stop-motion video created by middle school students in the collaborative stop-motion project known as The Longfellow Ten. (01:03)
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child demonstrating how to paint on canvas
This video shows a child artist named Maya demonstrating the steps of how to paint on canvas. She begins by showing her sketch book and then shows how to mix the paint for the painting. (9:12)
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1.2 Expressing ratios

To make short crust pastry, one recipe book says ‘use one part of fat to two parts of flour’; another recipe says ‘use fat and flour in the ratio of one to two’; and yet another says ‘use half as much fat as flour’. These are different ways of expressing the same ratio. Ratios are often expressed as fractions. So in this case:

Author(s): The Open University

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Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share

Hitler Watches His 50th Birthday Parade
This is actual footage of Hitler celebrating his birthday with a parade showcasing soldiers marching. (09:10)
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Hitler's Death - The Final Report - Part 1 of 5
The first part of the documentary that show the last events in Hitler's life. There is footage and an account of the last war events. There is a description of Hitler's bunker.This video is a mixture of actual footage and dramatization.

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Aztecs: Inside the hidden empire 4/5
Aztec Poetry is described. There is an account of the issues poetry described. The God of poetry is described. Time of desease and starvation are refered to. The need of sacrifice was high in order to offer to the Gods a sacrifice that would sufice the Gods and bring better times. The importance of the temple to the God of rain is stated and there are images of a historian who explores the aquaducts. The Spaniard conquest is introduced. The Group led by Cortes arrived and the Aztecs were totally
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Glass Lab 1-25-12
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How To Play Badminton
Step-by-step guide gives directions to play the game while the video demonstrates what to do. Explains the use of the equipment and how to score the game.  2:21 min.
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Korean War ( The road to Seoul ) 5/15
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How To Teach Number Comparisons - Math Game
Learn how to play and teach this number comparison game for practicing comparing numbers with expert, Courtney Hester, teaching tips in this math games video clip.

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Rock and Roll - A Brief History
This is an historical snapshot of rock and roll music a new style of music that became popular in 1951.  The video explains how money influenced music and tells of its cross-racial appeal.  Explores briefly the career of Elvis Presley. Video uses still images. (02:39)
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Solving Proportions Using Cross Multiplication
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Join several Journey North classrooms as they become engaged in the study of tulip bulbs, and track their growth from fall to spring. In this large experiment students across the Northern Hemisphere track the growth of the same plant
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Cartesian Capers & Pascal's Pressure Principle
Life's a Lab Science Club: The Plunger, Egg Trick, Pascal's Principle, Cartesian Catsup, Hook & Squidy Divers, Honey I Shrunk (& Blew Up) the Marshmallows, Shrink-Wrapped Kids!


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Market Pulse: Has the euro Emperor found some clothes?
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Jolly Old Saint Nicholas - Christmas Song
A great Christmas song classic about an old saint, Saint Nicholas, the original Santa Claus. This Christmas song classic, Jolly Old Saint Nicholas, in an easy-to-teach, easy-to-learn version for children, kids, babies, and toddlers in first grade, kindergarten, preschool, or homeschool

Lyrics:
♫ Jolly Old Saint Nicholas,
Lean your ear this way;
Don't you tell a single soul
What I'm going to say,
Christmas Eve is coming soon;
Now my dear old man,

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