Before this discovery, it is widely believed that bricks appeared about 3000 years ago in the Western Zhou dynasty since the earliest bricks were found in Western Zhou ruins.

Before Moseley's discovery, the atomic numbers ( or elemental number ) of an element had been thought of as a semi-arbitrary sequential number, based on the sequence of atomic masses, but modified somewhat where chemists found this to be desirable, such as by the great Russian chemist, Dimitri Ivanovich Mendeleev.

Before the actual discovery of mendelevium, the trivalent state was the most stable one in aqueous solution.

Before Leeuwenhoek's discovery of microorganisms in 1675, it had been a mystery why grapes could be turned into wine, milk into cheese, or why food would spoil.

( Before the discovery of quarks, the term " strong interaction " referred to just internucleon interactions.

Before the relatively recent discovery of neurons and their role in pain, various different body functions were proposed to account for pain.

Before the discovery of the ubiquitin proteasome system, protein degradation in cells was thought to rely mainly on lysosomes, membrane-bound organelles with acidic and protease-filled interiors that can degrade and then recycle exogenous proteins and aged or damaged organelles.

Before the discovery of a live coelacanth specimen, the coelacanth time range was thought to have spanned from the Middle Devonian to the Upper Cretaceous period.

Before the discovery of refrigeration, many sushi connoisseurs were at risk of contracting diseases.

Before the discovery of quantum effects and other challenges to Newtonian physics, " uncertainty " was always a term that applied to the accuracy of human knowledge about causes and effects, and not to the causes and effects themselves.

Before announcing the discovery, the foundation first recruits as many of these people as it can.

Before Scheele made his discovery of oxygen, he studied air.

Before the synthesis of ununseptium, none of ununseptium's daughter isotopes were known ; thus, there was no basis for an JWP discovery claim, much less for its recognition.

Before the discovery of tetracycline and chloramphenicol during the latter 1940s, as many as 30 percent of persons infected with R. rickettsii died.

Before the discovery of antibiotics, pure mountain air was thought to be curative for patients with tuberculosis.

Before he reveals this discovery to the other Eternals, Harlan exacts a price, his lover is to be returned to him and both will go back to rescue Cooper.

Before the discovery of Centurion, the tallest known specimen was Icarus Dream, which was rediscovered in Tasmania in January, 2005 and is high.

Before the discovery of Mendelian genetics, one common hypothesis was blending inheritance.

Before the discovery of ribozymes, enzymes, which are defined as catalytic proteins, were the only known biological catalysts.

Before the discovery of iron and sulphur rich water, Harrogate comprised two hamlets, High Harrogate and Low Harrogate, close to the historic town of Knaresborough.

Before the discovery of magnetite in 1727, Kamaishi was little different from any of the other small fishing communities along the coast.

Before its discovery, the taxon was believed to have become extinct during the Miocene ; when it was discovered, it was heralded as a " living fossil ".

Before the discovery of Hyperion, the tallest redwood ever measured was the Dyerville Giant, also in Humboldt Redwoods State Park.

Before the discovery of America, the word Hart was common in surnames.

) Before it had been assumed that the bomb itself would require many tons of uranium, implying that it was theoretically possible, but not a practical military device.

Before the Draft Act was passed Baker had confidentially briefed governors, sheriffs, and prospective draft board members on the administration of the measure -- and the confidence was kept so well that only one newspaper learned what was going on.

Before the fight was over, the Harlem boy had a concussion and Trig was cut up badly.

Before he left the apartment he knocked on their door and asked if there was anything he could do for them.

Before he left town Pat saw to it that I was fixed up with a job.

Before the airplanes came, he said, travel in Laos was just about impossible.

Before coming on a visit to Spelman in 1885, Miss Mary had been a successful teacher in Worcester, and her position there was held open for her for a considerable period.

Before he was forty Griffith had created the art of the film.

Before appealing to the U.N. or to Russia, he first appealed to the U.S. for military help, and was rejected.

Before her chore was finished she was rescuing wind-blown sheets of music, trundling microphones about the stage, helping to move the piano and otherwise joining in the informal atmosphere.

Before ASCII was developed, the encodings in use included 26 alphabetic characters, 10 numerical digits, and from 11 to 25 special graphic symbols.

Before Europeans discovered other oceans, the term " ocean " itself was synonymous with the waters beyond the Strait of Gibraltar that we now know as the Atlantic.

Before he could pass the river with safety, however, it was necessary to subdue certain fortresses, one of which was for several days vigorously defended by the governor, Yussuf el-Harezmi, a Khwarezmian.

Before the 1989 series began, the win-loss ratio was almost even, with 87 wins for Australia to England's 86, 74 having been drawn.

Before the late modern era, the abbot was treated with the utmost reverence by the brethren of his house.

Before the creation of the world, God was all by Himself, in a Self-absorbed state.

Before the Tennessee electorate voted on secession, Johnson, at his peril, toured the state, speaking in opposition to the measure, contending it was unconstitutional.

Before his death, he was absolved from the excommunication ; moreover, the Pope also promised that the King of Hungary and his relatives would not be excommunicated without the special permission of the Pope.

Before the 2007 season began, Vick was suspended indefinitely by the NFL after pleading guilty to charges involving dog fighting in the state of Virginia.

Before the War, Paul was a creative, sensitive, and passionate person, writing poems and having a clear love for his family.

Before the war Tjaden was a locksmith.