Glidden's Patent Application for Barbed Wire
This lesson presents the drawing and description that helped Joseph Glidden, a farmer from De Kalb, Illinois, win a patent for barbed wire in 1874. Glidden's design remains today the most familiar style of barbed wire. This site also examines the considerable impact of barbed wire on the economy, society, and politics in the West.
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The Colony of Jamestown
Learn who came over to Jamestown and why they came in the first place!
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Stop Disasters!
The on-line game aims at teaching children how to build safer villages and cities against disasters. Children will learn playing how the location and the construction materials of houses can make a difference when disasters strike and how early warning systems, evacuation plans and education can save lives. Children are the future architects, mayors, doctors, and parents of the world of tomorrow, if they know what to do to reduce the impact of disasters, they will create a safer world. Each scen
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Blefaroplastia del Reborde Orbitario
Scenes in Spanish of plastic surgery of above the eye.
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Behavioral Genetics (Mendelian): Sanitary Bees - Animal Behavior
This course covers the principles of biology as they relate to animal behavior, with broad coverage of animal groups. Special attention will be paid to the emerging discipline of behavioral ecology.
Author(s): Roy Caldwell

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Animal camouflage
Some animals are capable of concealing themselves against their surroundings. The patterns, colors, or behaviors they show that help them accomplish this are called camouflage.
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An apple
Objects appear to be certain colors because of reflection and absorbance. Light is made up of different wavelengths that our eyes detect and convert into colors. The apple looks green because it reflects the wavelengths that correspond to the color we see as green. The apple absorbs all other wavelengths of light.
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"Quasi-Balanced Circulations in Oceans and Atmospheres, Fall 2009"
" This course introduces the students to dynamics of large-scale circulations in oceans and atmospheres. Basic concepts include mass and momentum conservation, hydrostatic and geostrophic balance, and pressure and other vertical coordinates. It covers the topics of fundamental conservation and balance principles for large-scale flow, generation and dissipation of quasi-balanced eddies, as well as equilibrated quasi-balanced systems. Examples of oceanic and atmospheric quasi-balanced flows, compu
Author(s): Emanuel, Kerry

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Listening, speaking, grammar: Wo ich wohne... wohne ich gerne!
You practice your speaking skills in connection with describing a house and the plural forms of nouns.
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Beowulf : Literature
beowulf.jpg

Je vindt hier een lessenreeks rond het Oudengelse gedicht Beowulf. De leerlingen kijken naar fragmenten uit de verfilming van Beowulf en worden op die manier vertrouwd met het verhaal. Ze leren gelezen fragmenten uit Beowulf begrijpen. Aan de hand …


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Postboxes in postcode IP19
A collection of postboxes in postcode IP19
Author(s): Adrian Cable

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San Diego Opera Kids Vidz - La boheme

Video link (see supported sites below). Please use the original link, not the shortcut, e.g. www.youtube.com/watch?v=abcde

Author(s): San Diego Opera

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Cambridge and First Time Volunteering
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Author(s): Ashley Dace

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Postboxes in postcode IP13
A collection of Postboxes in Postcode IP13
Author(s): Adrian Cable

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Postboxes in postcode IP12
A collection of postboxes in postcode IP12
Author(s): Adrian Cable

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Saturday Night on the Range: Rural Life in World War I Era Montana
We often like to imagine rural life in the past as timeless, "traditional," and in some way simpler and more authentic. Yet, rural life in the years around World War I, while sometimes recalled as simpler, could often seem very much like life anywhere else. In this interview, conducted by Laurie Mercier in 1982 for the Montana Historical Society, Tom Staff remembers how Montana farmers took other jobs to supplement their incomes. Here he described how the road crew he worked on left camp for dan
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Billionaire Batista to U.S.: Make it in America
Brazilian billionaire Eike Batista says if the United States wants to keep more jobs onshore, companies need to buy American.
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Small Regulatory RNAs May Sharpen Spatial Expression Patterns
The precise establishment of gene expression patterns is a crucial step in development. Formation of a sharp boundary between high and low spatial expression domains requires a genetic mechanism that exhibits sensitivity, yet is robust to fluctuations, a demand that may not be easily achieved by morphogens alone. Recently, it has been demonstrated that small RNAs (and, in particular, microRNAs) play many roles in embryonic development. Whereas some RNAs are essential for embryogenesis, others ar
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Pendennis Castle N900020

PENDENNIS CASTLE, Cornwall. c.1894. Reconstruction drawing of Half Moon Battery. Men working in the cartridge store by Ivan LAPPER.


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Exercice 13 (Arithmétique dans Z) [00337] (video)

Exo7. Exercices de mathématiques pour les étudiants.
Retrouvez la correction écrite sur http://exo7.emath.fr

Bonus (à 2'39'') : lemme d'Euclide, lemme de Gauss


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