Discrete Time Complex Exponential
Dan Calderon, Richard Baraniuk, Stephen Kruzick
Describes the complex exponential function for discrete time.

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Obsessions with the Unknown - Dr Bill Durodié
Dr Bill Durodié (Resilience Centre, Cranfield University). When former US Secretary of State for Defence, Donald Rumsfeld, warned of the dangers lurking within the 'unknown unknowns' at a press conference in 2002, he was using an increasingly common argument - widely advocated by environmental campaigners before him - that the risks we should really worry about are those that we don't even know we know nothing about. Is this line of argument fruitful for risk management processes or is society
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8.1 Reading 1: The Lancet Paper

Fitzpatrick, M. (2004) Chapter 8 ‘The Lancet Paper’ taken from MMR and Autism: What Parents Need to Know, London, Routledge. Copyright © 2004 Michael Fitzpatrick.

We identified associated gastrointestinal disease and developmental regression in a group of previously normal children, which was generally associated in time with possible environmental triggers.

(Wakefield et al., 1998,
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First day of the Somme (annotated)

The National Archives UK posted a photo:

First day of the Somme (annotated)

Catalogue reference: WO 153/167

This trench map shows the objectives of the British Army’s 29th Infantr
Author(s): nobody@flickr.com (The National Archives UK)

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Pakistan blast kills at least 34
Aug19 - A bomb rips through the side of a mosque in northwest Pakistan. No one has claimed responsibility but Al Qaeda-linked militants vowed to avenge bin Laden's death in May. Lily Grimes reports.
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The Busy World of Richard Scarry-Imagine That - Elevator
In this video Huckle and Lowly Worm ride an elevator. An elevator is a machine that moves people up and down. The video shows how an elevator works. Elevators help us to move lots of things. This is a good teaching resource for a unit on simple machines (pulleys, levers, etc.). Elementary students will enjoy this video (1:06).
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How to Teach Piano to Kids: Basic Beats for Children's Piano Lessons

Expert Village video.  This lesson is taught by Hope Wells.  How to teach rhythm to children, including tips for making it fun. Good quality video. (03:58)


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Buoyancy
Here's a quick lesson in buoyancy. It compares the weight of an object in the air compared to in the water. English captions are at the bottom of the screen. The words are small so the viewer may want to open the video to 'full screen'.
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"The Eagle" Poem by Alfred, Lord Tennyson
Short, powerful poem THE EAGLE By Alfred, Lord Tennyson, read with British accent by David Shaw Parker, accompanied by a single color painted image of the regal eagle.  (00:25)
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Desmond Video
An old friend visits Toot.
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Freshwater and International Law: Universal and Regional Perspectives
Professor de Chazournes delivers the 2009 Louwes Lecture on the development of International and National Law concerning the use of freshwater, environmental issues and the international laws protecting people's human rights to fresh water.
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Interview with the parents of Kory Slack
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Pride & Prejudice (1995) Episode 2 (Part 5/6)
This is an adaptation of Jane Austen's novel, Pride and Prejudice. 

This movie is an almost perfect adaptation of the novel.  This is part

5 of 6 parts.

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2.8 End of course question

Question 12

The writer and campaigner George Monbiot wrote the following (in The Guardian Weekly, 10 February 2000): 'Every time someone in the West switches on a kettle, he or she is helpting to flood Banglades
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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:

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"1500 Doomed": People's Press Reports on the Gauley Bridge Disaster
The deadly lung disease silicosis is caused when miners, sandblasters, and foundry and tunnel workers inhale fine particles of silica dust--a mineral found in sand, quartz, and granite. In 1935, approximately 1,500 workers--largely African Americans who had come north to find work--were killed by exposure to silica dust while building a tunnel in Gauley Bridge, West Virginia. Ordinarily, silicosis takes a several years to develop, but these West Virginia tunnel workers were falling ill in a matt
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7.1 The spectra of galaxies

  • The spectrum of a galaxy is the composite spectrum of the objects of which it is composed.

  • The optical spectrum of a normal galaxy contains contributions from stars and HII regions. An elliptical galaxy has no HII regions and has an optical spectrum that looks somewhat like a stellar spectrum but with rather fainter absorption lines. A spiral galaxy has both stars and star-forming regions, and its optical spectrum is the composite of its st
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Inside Purdue Admissions: Campus Visits
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