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Ancestry magazine focuses on genealogy for today’s family historian, with tips for using Ancestry.com, advice from family history experts, and success stories from genealogists across the globe. Regular features include “Found!” by Megan Smolenyak, reader-submitted heritage recipes, Howard Wolinsky’s tech-driven “NextGen,” feature articles, a timeline, how-to tips for Family Tree Maker, and insider insight to new tools and records at Ancestry.com. Ancestry magazine is published 6 times yearly by Ancestry Inc., parent company of Ancestry.com.
A major new work from one of the world's most erudite, intellectual, and influential thinkers and writers about sound and music. >
In 1690, Christiaan Huygens (1629-1695) published Traité de la Lumière, containing his renowned wave theory of light. It is considered a landmark in seventeenth-century science, for the way Huygens mathematized the corpuscular nature of light and his probabilistic conception of natural knowledge. This book discusses the development of Huygens' wave theory, reconstructing the winding road that eventually led to Traité de la Lumière. For the first time, the full range of manuscript sources is taken into account. In addition, the development of Huygens' thinking on the nature of light is put in the context of his optics as a whole, which was dominated by his lifelong pursuit of theoretical ...