月別アーカイブ: 2015年5月

Unraveling Freedom: The Battle for Democracy on the Home Front During World War I

Unraveling Freedom: The Battle for Democracy on the Home Front During World War I by Ted Rall
English | Nov 9, 2010 | ISBN: 1426307020 | 96 Pages | EPUB | 3 MB

In 1915, the United States experienced the 9/11 of its time. A German torpedo sank the Lusitania killing nearly 2,000 innocent passengers. The ensuing hysteria helped draw the United States into World War I—the bitter, brutal conflict that became known as the Great War and the War to End All Wars. But as U.S. troops fought to make the world safe for democracy abroad, our own government eroded freedoms at home, especially for German-Americans. Free speech was no longer an operating principle of American democracy. Award-winning author Ann Bausum asks, just where do Americans draw the line of justice in times of war?

Drawing thought-provoking parallels with President Wilson’s government and other wartime administrations, from FDR to George W. Bush, Bausum’s analysis has plenty of history lessons for the world today. Her exhaustive research turns up astonishing first-person stories and rare images, and the full-color design is fresh and stunning. The result is a gripping book that is well-positioned for the run-up to the World War I centennial.

National Geographic supports K-12 educators with ELA Common Core Resources.
Visit www.natgeoed.org/commoncore for more information.

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Choosing and Using Astronomical Filters [Repost]

Martin Griffiths – Choosing and Using Astronomical Filters
Published: 2014-06-21 | ISBN: 1493910434 | PDF | 269 pages | 15.42 MB

As a casual read through any of the major amateur astronomical magazines will demonstrate, there are filters available for all aspects of optical astronomy. This book provides a ready resource on the use of the following filters, among others, for observational astronomy or for imaging:
Light pollution filters
Planetary filters
Solar filters
Neutral density filters for Moon observation
Deep-sky filters, for such objects as galaxies, nebulae and more
Deep-sky objects can be imaged in much greater detail than was possible many years ago. Amateur astronomers can take photographs that rival those of professional observatories! The ability to do this has been brought about by the revolution in CCD cameras and improved filters.The book pinpoints which astronomical objects are best observed with which filters. Post-processing (using Photoshop) is also discussed, since it is helpful in further improving filtered astro images.The last part of the book is an observational guide to 100 deep sky objects that benefit from the use of filters – all personally observed by the author – with notes on the filters used (or potentially of use) in their observation and imaging. There are also notes on their celestial coordinates, magnitudes and other pertinent information.

No Other Mirrors, Please!

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On the Dot: The Speck That Changed the World

Alexander Humez, Nicholas Humez – On the Dot: The Speck That Changed the World
Published: 2008-10-02 | ISBN: 0195324994 | PDF | 272 pages | 2.88 MB

Despite the humble origins of its name (Anglo Saxon for "the speck at the head of a boil"), the dot has been one of the most versatile players in the history of written communication, to the point that it has become virtually indispensable. Now, in On the Dot, Alexander and Nicholas Humez offer a wide ranging, entertaining account of this much overlooked and minuscule linguistic sign.
The Humez brothers shed light on the dot in all its various forms. As a mark of punctuation, they show, it plays many roles–as sentence stopper, a constituent of the colon (a clause stopper), and the ellipsis (dot dot dot). In musical notation, it denotes "and a half." In computerese, it has several different functions (as in dot com, the marker between a file name and its extension, and in some slightly more arcane uses in programming languages). The dot also plays a number of roles in mathematics, including the notation of world currency (such as dollars dot cents), in Morse code (dots and dashes), and in the raised dots of Braille. And as the authors connect all these dots, they take readers on an engaging tour of the highways and byways of language, ranging from the history of the question mark and its lesser known offshoots the point d'ironie and the interrobang, to acronyms and backronyms, power point bullets and asterisks, emoticons and the "at-sign."
Playful, wide-ranging, and delightfully informative, On the Dot reveals how thoroughly the dot is embedded in our everyday world of words and ideas, acquiring a power inversely proportional to its diminutive size.

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Was ist was?, Band 21: Der Mond by Erich Ubelacker

Was ist was?, Band 21: Der Mond by Erich Ubelacker
Deutsch | Dec 1, 2001 | ISBN: 3788602619 | 48 Seiten | PDF | 15.2 MB

Warum fällt der Mond nicht auf die Erde? Warum gibt es Ebbe und Flut? Was ist eine Mondfinsternis? Diese und viele andere Fragen beantwortet der Autor Professor Dr. Erich Übelacker, der langjährige Leiter des Planetariums in Hamburg. Anschauliche Illustrationen zeigen die Wechselwirkungen zwischen Sonne, Mond und Erde. Die Apollo-Flüge zum Mond, die einen Höhepunkt in der Geschichte der Raumfahrt darstellen, haben ebenso einen Platz im Buch wie die Frage, ob wir zukünftig auf dem Mond wohnen können. Der Band zeigt eindrucksvoll, dass der Mond und sein Einfluss auf die Erde und den Menschen noch keineswegs vollständig erforscht sind. Auch in Zukunft wird er ein Ziel der bemannten Raumfahrt bleiben.