The Virtual Bookcase : Shelf History
Historic events and historic backgrounds that shape our current time.
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Book descriptionOn October 23, 1852, Professor Augustus De Morgan wrote a letter to a colleague, unaware that he was launching one of the most famous mathematical conundrums in history--one that would confound thousands of puzzlers for more than a century. This is the amazing story of how the "map problem" was solved. The problem posed in the letter came from a former student: What is the least possible number of colors needed to fill in any map (real or invented) so that neighboring counties are always colored differently? This deceptively simple question was of minimal interest to cartographers, who saw little need to limit how many colors they used. But the problem set off a frenzy among professional mathematicians and amateur problem solvers, among the...
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Book descriptionRevolution of one is a simple guide to reclaiming your life and transforming our world. This revolutionary journey starts at home, with 10 personal practices that improve your life, deepen your consciousness, and transform your relationship with those around you. These practices are Ecological Living, Study, Organization, Meditation, Visualization, Energy Work, Live Foods, Creative Activity, Friendship, and Play. Your foundation of personal growth empowers you to become a force for transformation in your community. This process is supported by 8 types of community organizations. These organizations are Study Groups, Consciousness-Raising Groups, Housing Cooperatives, Community Enterprise, Community Agriculture, Social Services, Community Ce...
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