Several allotropes of boron exist: amorphous boron is a brown powder and crystalline boron is black, extremely hard ( about 9. 5 on the Mohs scale ), and a poor conductor at room temperature.

Several factors contributed to the re-emergence of Idar-Oberstein as agate center of the world: ships brought agate nodules back as ballast, thus providing extremely cheap transport.

Several thousand people from North Carolina, mainly from Orange County, Anson County, and Granville County in the western region, were extremely dissatisfied with the wealthy North Carolina officials whom they considered cruel, arbitrary, tyrannical and corrupt.

Several people have been injured and killed in the falls as the granite rocks are extremely slippery so access to the top pool beyond the platforms is prohibited.

Several years later, the ongoing Yellow Fever outbreak in New Orleans was addressed by white engineers using a method extremely similar to what Rillieux had proposed.

Several species of pheasant and partridge are extremely important to humans.

Several astronomers, among them Rublev ( 1965 ) and Conti ( 1976 ) originally proposed that the WR stars as a class are descended from massive O-stars in which the strong stellar winds characteristic of extremely luminous stars have ejected the unprocessed outer H-rich layers.

Several other features separate them from the broadbills, they possess twelve tail feathers on extremely short ( almost non-existent in the Philepitta species ) tails, their syrinx is encased with a large bronchial ring and they have forked tongues adapted to nectivory.

Several decades after it was first published in 1919, the piece became extremely popular, and today it is frequently played at weddings and included on classical music compilations, along with other famous Baroque pieces such as Air on the G String by Johann Sebastian Bach.

Several of the species are extremely poisonous, the active poison being oenanthotoxin.

Several prominent physicists have been extremely critical of the underlying physical theory, calling it " extremely unlikely ", " bull shit " and " fraud " and suggesting that their investors are fools and dupes, while IEEE Spectrum magazine listed BlackLight as a " loser " technology.

Several safety systems, such as the Fraser-Sweatman system, have been devised so that filling a plenum vaporiser with the wrong agent is extremely difficult.

Several variations were proposed, using a common clustered first stage, and upper stages based on either the Atlas or Titan I. ABMA favored the Titan as the Atlas production was extremely high-priority and there was little or no excess capacity to spare.

Several corporations source an extremely wide range of products from specialized manufacturers, which may or may not own their brand.

Several photos were taken providing a close look at the Raisins ' internal armatures and detailing their extremely poor condition, including the absence of the A. C. puppet's head.

Several of their plays, especially pandavodyogavijayalu have been extremely popular with many drama clubs and audiences across Andhra Pradesh.

Several major contributions were received, and the Calcutta millionaire Sir David Yule proved extremely helpful.

Several months later a decisive moment came when Scarf found a way, albeit extremely complicated, of proving the Edgeworth conjecture ; see his 1961 paper: `` An analysis of markets with a large number of participants ”.

Several dozen to several hundred people may be known, but the quality time spent with others is extremely limited: only those to whom quality ( face-to-face ) time is devoted can be said to be a part of an oikos.

Several Jewish bankers became extremely influential, successfully competing with non-Jewish banking houses in the floating of government loans.

Several fields of discrete mathematics, particularly theoretical computer science, graph theory, and combinatorics, are important in addressing the challenging bioinformatics problems associated with understanding the tree of life.

Several institutions, besides those already mentioned, played important parts.

Several billion kilograms of polyesters are produced industrially annually, important products being polyethylene terephthalate, acrylate esters, and cellulose acetate.

Several important cinematic movements, including the Nouvelle Vague, began in the country.

Several types are existent in Qing dynasty and used in dishes of stewing hams ( 火腿炖肘子 ), and vegetables, or for a wide variety of soup and important soup stocks.

Several important institutional changes took place in this period, such as free and mandatory schooling introduced 1842 ( as first country in the world ), the abolishment of a previous national monopoly on trade in handicrafts in 1846, and a stock company law in 1848.

His critically acclaimed book Lyrics on Several Occasions of 1959, an amalgam of autobiography and annotated anthology, is an important source for studying the art of the lyricist in the golden age of American popular song.

Several formerly important franchise courts were not officially abolished until Courts Act of 1971.

Several important buildings and structures were built during this time, including the Kansas City City Hall and the Jackson County Courthouse — both added new skyscrapers to the city's growing skyline.

Several industry groups also recognize light pollution as an important issue.

Several types of molecules are particularly important during morphogenesis.

Several of the more important ways observations can be affected by human psychology are given below.

Several other important engravers also made cards, including Master ES and Martin Schongauer.

Several economically important products come from Rosaceae, including many edible fruits ( such as apples, apricots, plums, cherries, peaches, pears, raspberries, and strawberries ), almonds, and ornamental trees and shrubs ( such as roses, meadowsweets, photinias, firethorns, rowans, and hawthorns ).

Several important political innovations of classical antiquity came from the Greek city-states and the Roman Republic.

Several Referendums supported the state being in control of the most important utilities and energy companies.

Several important modern cities, including Stockholm and Lviv, were founded in the 1250s.

Several important cultural achievements were made in the decade, including publication of Roger Bacon's important scientific work Opus Majus and Thomas Aquinas ' Summa contra Gentiles.

Several lakesthe most important of which are Lake Herăstrău, Lake Floreasca, Lake Tei, and Lake Colentinastretch across the northern parts of the city, along the Colentina River, a tributary of the Dâmbovița.

Several singular oak trees, such as the Royal Oak in Britain and the Charter Oak in the United States, are of great historical or cultural importance ; for a list of important oaks, see Individual oak trees.

Several important trade routes from India and China ( including the Silk Road ) passed through Bactria and, as early as the Bronze Age, this had allowed the accumulation of vast amounts of wealth by the mostly nomadic population.

Several of Gauthier's students are now important moral, political, and legal philosophers in the United States and Canada.

Several important features of visual perception can be traced to the retinal encoding and processing of light.

Several important diseases of the nervous system are associated with dysfunctions of the dopamine system.