منابع مشابه
Was There a Big Bang ?
CIENCE IS a congeries of great quests, and cosmology is the grandest of the great quests. Taking as its province the universe as a whole, cosmology addresses the old, the ineradicable questions about space and time, nature and destiny. It is not a subject for the tame or the timid. For the first half of the 20th century, cosmology remained a discipline apart, as a clutch of talented but otherwo...
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Not long after Jim Watson's The Double Helix appeared, there was talk about making a movie about the DNA story. The author of the book took this very seriously and did not find all the many suggestions made to him very helpful. One idea put forward was that Jim should be played by Woody Allen and Francis Crick by Peter O'Toole. Another was to do it as a musical with a dance based on the entwini...
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China’s Approved Destination Status (ADS) policy governs foreign leisure travel by citizens to ADS-designated countries. To model the effects of ADS on Chinese visitor arrivals, we specify a model of demand for a representative Chinese consumer who values trips to n differentiated foreign destinations. Using panel data for Chinese visitor arrivals for 61 countries from 1985 to 2005, we estimate...
متن کاملWhen Bioterrorism Was No Big Deal
When Bioterrorism Was No Big Deal To better understand the potential economic repercussions of a bioterrorist attack, this paper explores the effects of several catastrophic epidemics that struck American cities between 1690 and 1880. The epidemics considered here killed between 10 and 25 percent of the urban population studied. A particular emphasis is placed on smallpox and yellow fever, both...
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On Monday January 19, 2015 a story broke that the National Football League (NFL) had started an investigation into whether the New England Patriots deliberately deflated the footballs they used during their championship win over the Indianapolis Colts. Like an infectious disease, discussion regarding Deflategate grew rapidly on social media sites in the hours and days after the release of the s...
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ژورنال
عنوان ژورنال: Nature
سال: 1986
ISSN: 0028-0836,1476-4687
DOI: 10.1038/320009b0