Egypt's political crisis

Bronx Cheer Bulb
In this activity, learners observe what happens when they give a light source like a neon glow lamp a "Bronx Cheer." The lights appear to wiggle back and forth and flicker when learners blow air through their lips. However, learners will discover that the only thing vibrating is themselves. Use this activity to explore different forms of light as well as visual perception.
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Breakingviews: Jefferies and the Street
Dec 18 - Breakingviews editors Richard Beales and Antony Currie discuss Jefferies' full-year earnings and the implications for the the U.S. investment bank's larger Wall Street compatriots.
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18.330 Introduction to Numerical Analysis (MIT)
This course analyzed the basic techniques for the efficient numerical solution of problems in science and engineering. Topics spanned root finding, interpolation, approximation of functions, integration, differential equations, direct and iterative methods in linear algebra.

1.2 How does it hurt?

This is a useful question because once we know the mechanism of pain sensation we can do something about alleviating it.

When tissue is injured there follows a rapid release of ‘messenger’ chemicals that stimulate the nerve endings. Electrical impulses are relayed through the nerves to the spinal column and to the brain, which registers the sensation of pain. It usually, but not always, also directs our attention to the site where the damaged tissue initiated the pain message.

4: Gravitational energy and energy conservation

The concept of gravitational energy greatly simplifies calculations concerned with the effect of gravity on the motion of objects, particularly where no other forces are concerned. For example, if you take your book (which by now is getting rather dogeared) and throw it vertically upwards in the air, it will slow down as it travels higher, and eventually reach a point where it is momentarily stationary. It will then accelerate downwards to where you (hopefully) catch it before it hits the gro
Author(s): The Open University

1 Unit overview

In this unit we'll be concerned with what type of science forms the basis of science education, and for what purpose. You'll explore these issues by reading the text that follows and by tackling the activities that are included; there are also a number of readings. In the latter part of this unit (Sections 10–14) we'll consider some of the practical problems involved in delivering an effective curriculum in science and look at key questions relevant to all three educational tiers –
Author(s): The Open University

Acknowledgements

Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit:

Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence

Author(s): The Open University

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4.5 Ellipse (0 < e < 1)

An ellipse with eccentricity e (where 0 < e < 1) is the set of points P in the plane whose distances from a fixed point F are e times their distances from a fixed line d. We obtain such an ellipse in standard form if

1. the focus F lies on the x-axis, and has coordinates (ae, 0), where a > 0;

2. the directrix d is the line with equation x = a
   Author(s): The Open University
   

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Introduction

This is the fifth and final unit in the MSXR209 series on mathematical modelling. In this unit we revisit the model developed in the first unit of this series on pollution in the Great Lakes of North America. Here we evaluate and revise the original model by comparing its predictions against data from the lakes before finally reflecting on the techniques used.

This unit, the fifth in a series of five, builds on ideas developed and introduced in Modelling pollution in the Great Lakes
Author(s): The Open University

16.430J Sensory-Neural Systems: Spatial Orientation from End Organs to Behavior and Adaptation (MIT)
This course introduces sensory systems and multi-sensory fusion using the vestibular and spatial orientation systems as a model. Topics range from end organ dynamics to neural responses, to sensory integration, to behavior, and adaptation, with particular application to balance, posture and locomotion under normal gravity and space conditions. Depending upon the background and interests of the students, advanced term project topics might include motion sickness, astronaut adaptation, artificial
Author(s): Oman, Charles M.,Young, Laurence R.,Merfeld, Danie

Lesson 07 - One Minute Luxembourgish
In lesson 07 of One Minute Luxembourgish you will learn to say that it's nice to meet someone in Luxembourgish. Remember - even a few phrases of a language can help you make friends and enjoy travel more. Find out more about One Minute Languages at our website - http://www.oneminutelanguages.com. One Minute Luxembourgish is brought to you by the Radio Lingua Network and is ©Copyright 2008.
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Machinarium : Game met puzzels en queesten

Machinarium is een educatief spel waarbij puzzels opgelost en queesten volbracht moeten worden. Het is een adventure-game met prachtige grafische beelden en een uitstekende game-play. De uitleg is in het Engels, maar vormt geen beletsel …