Cement In Russia, Egor Cheliev created a new binder by mixing lime and clay. His results were published in 1822 in his book A Treatise on the Art to Prepare a Good Mortar published in St. Petersburg. A few years later in 1825, he published another book, which described various methods of making cement and concrete, and the benefits of cement in the construction of buildings and embankments.Formaldehyde Formaldehyde systematic name methanal is a naturally occurring organic compound with the formula CH 2 O HCHO . It is the simplest of the aldehydes RCHO . The common name of this substance comes from its similarity and relation to formic acid.. Formaldehyde is an important precursor to many other materials and chemical compounds.Pullup exercise The exercise is performed by pulling the chest up to the bar. The body is held in a rigid plank position while the heels remain on the floor. Supine refers to the body being faceup, not to the grip: supine rows can be done with prone, neutral or supinated hands.Wikipedia:Reference desk/Archives/Miscellaneous/January 2006 Both will add to your resume and prove that you can work in a team. Also, try to identify what is making you unemployable. It could be your look, for example in you have hundreds of face peircings, it could be your way of talking, if they can barely understand you, or it might be how you are dressed, etc. StuRat 21:07, 3 January 2006 UTC Doughnut Russia Ukrainian pampushky filled with sour cherries In Russia and the other PostSoviet countries , ponchiki Russian : , plural form of , ponchik or pyshki Russian : , especially in St. Petersburg are a very popular sweet doughnut, with many fast and simple recipes available in Russian cookbooks for making them at home as a breakfast or coffee pastry.Rubber band Thus, rubber bands numbered 819 are all 116 inch wide, with lengths going from 78 inch to 3 12 inches. Rubber band numbers 3035 are for width of 18 inch, going again from shorter to longer. For even longer bands, the numbering starts over for numbers above 100, again starting at width 116 inch.2000s decade The 2000s pronounced twothousands is a decade of the Gregorian calendar that began on January 1, 2000, and ended on December 31, 2009.. The early part of the decade saw the longtime predicted breakthrough of economic giant China, which had doubledigit growth during nearly the whole decade.To a lesser extent, India also benefited from an economic boom, which saw the two most populous .Wikipedia:Reliable sources/Noticeboard The guideline that most directly relates to whether a given source is reliable is Wikipedia:Reliable sources.. It has an explanatory supplement at Wikipedia:Reliable sources/Perennial sources. The policy that most directly relates is: Verifiability. If your question is about whether material constitutes original research, please use the No original research notice board.Subprime mortgage crisis The United States subprime mortgage crisis was a nationwide financial crisis, occurred between 2007 and 2010, that contributed to the U.S. recession of December 2007 June 2009. It was triggered by a large decline in home prices after the collapse of a housing bubble, leading to mortgage delinquencies, foreclosures, and the devaluation of housingrelated securities.