In mathematics and theoretical physics, mirror symmetry is a relationship between geometric objects called Calabi–Yau manifolds(pictured). The term refers to a situation where two Calabi–Yau manifolds look very different geometrically but are nevertheless equivalent when employed as extra dimensions of string theory. Mirror symmetry was originally discovered by physicists. Mathematicians became interested in this relationship around 1990 when Philip Candelas, Xenia de la Ossa, Paul Green, and Linda Parks showed that it could be used as a tool in a branch of mathematics called enumerative geometry. Today mirror symmetry is a major research topic in pure mathematics, and mathematicians are working to develop a mathematical understanding of the relationship based on physicists' intuition. Mirror symmetry is also a fundamental tool for doing calculations in string theory, and it has been used to understand aspects of quantum field theory, the formalism that physicists use to describe elementary particles. Major approaches to mirror symmetry include the homological mirror symmetry program of Maxim Kontsevich and the SYZ conjecture of Andrew Strominger, Shing-Tung Yau, and Eric Zaslow. (Full article...)
... that in its earlier years, the soft drinkBludwine was marketed as having health benefits, such as aiding in digestion, and some physicians in Georgia prescribed it to their patients?
... that French printer Denis Janot (fl. 1529–1544) came from families of printers on both sides and married into another family of printers, and after his death his wife married another printer?
... that there are nearly 900 macroinvertebrates per square meter in the lower reaches of West Creek?
... that Kalman Mann, a seventh-generation Jerusalemite, passed the entrance exam at the London School of Economics though he could barely speak English?
1877 – An 8.5 Ms earthquake struck the northern portion of Chile, resulting in the death of 2,541 people, including victims of the ensuing tsunami as far away as Hawaii and Japan
Description of the Western Isles of Scotland is the oldest known account of the Hebrides and the Islands of the Clyde, two chains of islands off the west coast of Scotland. The author was Donald Monro, a clergyman who used the title of "Dean of the Isles" and who lived through the Scottish Reformation. Monro wrote the original manuscript in 1549, although it was not published in any form until 1582 and was not widely available to the public in its original form until 1774. A more complete version, based on a late 17th-century manuscript written by Sir Robert Sibbald, was first published as late as 1961. Monro wrote in Scots and some of the descriptions are difficult for modern readers to render into English. Although Monro was criticised for publishing folklore and for omitting detail about the affairs of the churches in his diocese, Monro's Description is a valuable historical account and has reappeared in part or in whole in numerous publications, remaining one of the most widely quoted publications about the western islands of Scotland(Sula Sgeir pictured). (Full list...)
The nave of the parish church of Urtijëi, Italy; the church, dedicated to the Epiphany and to Saint Ulrich, was constructed in the 1790s and features painted domes and sculptures.
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