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Arctic Sea Ice 2008

The polar ice caps have been shrinking in summer and expanding in winter for millions of years. But in the last 3 decades, the arctic sea ice at the end of each summer's melt has been getting steadily smaller.

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Slow Motion Lightning

Amazing slow motion footage of a lightning bolt.

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Breakingviews: Fiscal cliff dividends
Jeffrey Goldfarb and Breakingviews columnists discuss how a wave of special dividends being paid out before year's end are indicative of how Corporate America fears higher taxes more than a recession.
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Lesson 07 - One Minute Romanian
In lesson 7 of One Minute Romanian you will learn to say that it's nice to meet someone in Romanian. Remember - even a few phrases of a language can help you make friends and enjoy travel more. Find out more about One Minute Romanian at our website - http://www.oneminutelanguages.com. One Minute Romanian is brought to you by the Radio Lingua Network and is ©Copyright 2008.Author(s): No creator set

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Climate Change and Food Security: Challenges, Success and Opportunities in Bangladesh
By: UP Los Baños Presentation by Mr. Mohammad Alamgir, Senior Scientific Officer (Forestry), Ministry of Water Resources, Bangladesh. Delivered during the International Conference on Climate Change Impacts and Adaptation for Food and Environmental Security, November 21-22, 2012 at SEARCA, UPLB, College, Laguna, Philippines.
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Successful Local Food Production Project in Solomon Islands: The Blue Print for the Pacific Islands
By: UP Los Baños Presentation by Dr. Ravindra C. Joshi, Consultant, Ministry of Primary Industries (Agriculture), Fiji Islands. Delivered during the International Conference on Climate Change Impacts and Adaptation for Food and Environmental Security, November 21-22, 2012 at SEARCA, UPLB, College, Laguna, Philippines.
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Splitsingen tot acht
splitsing1.JPG

In dit document worden de getalsplitsingen van vijf, zes, zeven en acht visueel voorgesteld. Leerlingen zien het getalbeeld, het splitsappartementje en de omkeringen. Ook de bij de voorstelling horende optellingen en aftrekkingen worden …


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Walter Lewin: Rainbows and Blue skies
Walter Lewin, world renowned MIT professor (emeritus) for his experiments and fascinating lectures, attracting millions of viewers on Youtube, offered guest lectures at TU Delft. These lectures are now online, available as OpenCourseWare. You can: Watch the lecture online, in Englis and in Dutch View photo’s on Flickr
Author(s): Martijn Ouwehand

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Glucose Fuel Cells: Brain-Implantable Electronic Devices that Run Like the Brain

"Glucose Fuel Cells: Brain-Implantable Electronic Devices that Run Like the Brain": Video component of the Application for the 2012-2013 Lemelson-MIT Student Prize, by Benjamin I. Rapoport.

 

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Environment: Following the flows
What affects the atmospheric and ocean flows? This unit explores the mechanisms that are important; the most rapid carrier is the wind. The basic principle of global atmospheric circulation is simple: warm air rises and cold air sinks. How does this principle affect the atmosphere and flow of water in practical terms? First publis
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Modelling pollution in the Great Lakes: a review
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 assumes you have studied Modelling pollution in the Great Lakes (MSXR209_1), Analysing skid marks (MSXR209_2), Developing model
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Introduction to histology
This free course provides an introduction to histology, the study of tissues. It also describes how histology can aid in the diagnosis of disease and explains how histology services are organised within a hospital. First published on Tue, 22 Mar 2016 as Author(s): Creator not set

Introduction to microscopy
This free course provides an introduction to microscopy and the operation of a simple light microscope, of the type found in histology courses and teaching laboratories. It outlines different methods used for preparing and staining tissue sections for microscopy, and explains how different stains can be used to identify particular cells, pathogens and anatomical structures.Author(s): Creator not set

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2.7 Inferring relationships of common ancestry

Activity 6

0 hours 10 minutes

This clip addresses the question of how one might go about building a tree, or inferring relationships of common ancestry, by recognising evolutionary novelties, or share
Author(s): The Open University

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4.2 Intermediate forms

In essence, the argument about intermediate forms runs as follows. If whales evolved from a terrestrial ancestor through the accumulation of small differences over time, we should expect to find the fossils of a number of ‘missing links’, i.e. creatures with a mixture of terrestrial and aquatic characteristics. In fact, we might expect to find a succession of such animals, each a little bit more whale-like and a little bit less well adapted to life on land than its predecessor.

To m
Author(s): The Open University

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Acknowledgements

The content acknowledged below is Proprietary (see terms and conditions) and is used under licence.

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

Figures

Figure 2(f) © National Power;

Figure 3 Courtesy of IBM Corporation, Research Division, Almaden Research Center;

Figure 14 ‘Fuel hoarder sentenced’ by Maurice Weaver, printed 6 April 2001, Telegraph Gro
Author(s): The Open University

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6.3.1 Refinements and difficulties

In Section 6.2, we said that inter-axis repulsions vary in the order:

non-bonded pair–non-bonded pair > non-bonded pair–bond pair > bond pair–bond pair

There is evidence for this in the inter-bond angles in molecules. For example, in wat
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4.5.2 Noble gas configurations under stress

It is remarkable how many molecules and ions of the typical elements can be represented by Lewis structures in which each atom has a noble gas shell structure. Nevertheless, many exceptions exist. According to the periodic trends summarised in Section 2, the highest fluorides of boron and phosphorus are BF3 and PF5. How
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4.5 More about covalent bonding

So far, the valencies in Table 1 have just been numbers that we use to predict the formulae of compounds. But in the case of covalent substances they can tell us more. In particular, they can tell us how the atoms are linked together in the molecule. This information is obtained from a two-dimensional drawing of the structural form
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3.3 Electronic configurations and the Periodic Table

Figure 21 has been designed for use in a particular thought experiment. The purpose of the thought experiment is to see how the electronic configuration of the atoms changes as one moves through the Periodic Table from beginning to end. We start with the hydrogen atom, which has one proton and one electron. Then we
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