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This is a brief outline of the development of string theory, the details of which will eventually fill many large volumes written by many people directly and indirectly involved in this rich and fascinating story.
This is a brief outline of the development of string theory, the details of which will eventually fill many large volumes written by many people directly and indirectly involved in this rich and fascinating story.
Throughout the last three thousand years, smallpox has shadowed civilization. A viral infection, the disease spread along trade routes, emerging first in Africa, Asia and Europe and reaching the Americas in the sixteenth century. Because smallpox requires a human host to survive it tended to smolder in densely populated areas, erupting in a full-blown epidemic every ten years or so.
Wherever it appeared, the legacy of smallpox was death, blindness, sterility and scarring.
While some medical practitioners claimed to cure smallpox, most medical traditions focused on prevention. Quarantining smallpox patients often limited the spread of the disease and was commonly used even into the twentieth century as there is no cure for smallpox.
The David Rumsey Historical Map Collection has over 8,800 maps online. The collection focuses on rare 18th and 19th century North and South America maps and other cartographic materials. Historic maps of the World, Europe, Asia and Africa are also represented. Collection categories include antique atlas, globe, school geography, maritime chart, state, county, city, pocket, wall, childrens and manuscript maps. The collection can be used to study history, genealogy and family history.
n the Third Annual Report of the Henry Draper Memorial, attention is called to the fact that the K line in the spectrum of Zeta Ursae Majoris occasionally appears double. The spectrum of this star has been photographed at the Harvard College Observatory on seventy nights and a careful study of the results has been made by Miss. A. C. Maury, a niece of Dr. Draper. The K line is clearly seen to be double in the photographs taken on March 29, 1887, on May 17, 1889 and on August 27 and 28, 1889. On many other dates the line appeared hazy, as if the components were slightly separated, while at other times the line appears to be well defined and single.
Last year saw two interesting events in the world of double stars, both of them connected with an astronomer's old friend in the Big Dipper. While the early history of double star astronomy had to be completely rewritten after an examination of 17th century Italian manuscripts, its future at the beginning of the next millennium was briefly unveiled by the amazing precision of a new astrometric instrument, which will soon eliminate the difference between spectroscopic and visual binaries.
Whether you are an academic, family historian, collector, teacher or parent - welcome! All the worthwhile information about old maps can be found here, or from here. The 100 'pages' of this carefully organised site offer comment and guidance, and many, many links - selected for relevance and quality
This paper deals with the English rejection of the Gregorian calendar in 1583, seeking to set this episode in its cultural, political and intellectual context. It concentrates particularly upon the work of John Dee, whose treatise of advice to the queen on the calendar reform is almost the only one of his major writings which has not (as far as I am aware) been studied in any depth in published writings.
Eötvös Loránd munkái és méltatása (Válogatás Eötvös Loránd tudományos és tudománypolitikai munkáiból, Eötvös Loránd és Eötvös József levelezése, versek, kinevezési dokumentumok, Eötvös Loránd méltatása, bibliográfiák)
The main events of the history of the psychology
are represented in a timeline that extends since the
year 600 before our era until the present time.
To make it faster for you, we have divided the
timeline in three parts:
Year 600 before our era to 1899
1900 to 1949
1950 up to our days
Daniel Bernoulli was born on January 29th 1700. He came from a long line of mathematicians. His father Johann was head of mathematics at Groningen University in the Netherlands. The family was prone to bitter rivalry: something he was to suffer when he became estranged from his father some 30 years later.
At the age of five, the Bernoulli family returned home to Basel in Switzerland, so that Johann's wife could be with her ailing father. Some years earlier Johann had applied to become professor of mathematics at Basel University, but this was denied him because his elder brother, Jakob had deliberately schemed to prevent him getting the post. Later Jakob got the professorship. En route to Basel, Johann learned that Jakob had just died of tuberculosis. He later recalled rather shamelessly that " ... I could succeed to my brother's position." He set about lobbying for the vacant position and in less than two months he got his way.