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Sinking of the Lusitania
In this clip from the Discovery Channel’s special "Sinking of the Lusitania," learn the world wide reaction to the sinking of the British ship. (02:17)
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Rupinder Brar on Relativity, Einstein, and How to Stay Young
Rupinder Brar lectures on the topic of Einstein's special relativity theory and it's explanation of time dilation and simultaneity. The lecture is entitled Relativity, Einstein, the Speed of Light and How to Stay Young.
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3.3 Dams

To economize on constructional materials and costs, it is desirable to build a dam at a narrow part of a valley so that the dam can be kept as short as possible. The quantity of constructional materials needed to build dams, and their cost, can be enormous. The Aswan High Dam, built during the 1960s, cost £400 million for a 1.2 km dam. Though shorter than the Aswan High Dam, the longest dam in Britain, the Kielder Dam in Northumberland (Author(s): The Open University

2.7 Multiple-cause diagrams

As a general rule, an event or outcome will have more than one cause. A multiple-cause diagram will enable you to show the causes and the ways in which they are connected. Suppose, for example, that you were asked to explain why a work group was under-performing. You could use a multiple-cause diagram both to help you to construct the explanation and to present it.

2.3 Multiplying powers

Powers of ten can be used to investigate what happens when two powers of the same number are multiplied together. For example, consider multiplying 10 by 100:

A billion is a thousand million. In terms of powers this is:

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Valley Forge, 1777 (The American Revolution)
When the Continental Army made camp at Valley Forge during the American Revolution, times were tough. The winter was bitter cold, and there was disease and hunger. (01:30)

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1.6.3 Supporting users and user processes

Use of a database involves user processes (either application programs or database tools) which must be developed outside of the database development. In terms of the three-schema architecture we now need to address the development of the external schema. This will define the data accessible to each user process or group of user processes. In reality, most DBMSs, and SQL itself, do not have many facilities to support the explicit definition of the external schema. However, by using built-in q
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#253: Sedimental journey: Probing climate's buried past to predict our future

Paleoclimatologist Prof Jonathan Overpeck describes how research into uncovering the earth’s climate history generates important insights about our climate future. Presented by Dr Shane Huntington.