Concrete is a composite construction material composed primarily of aggregate, cement and water. There are many formulations that have varied properties. The aggregate is generally a coarse gravel or crushed rocks such as limestone, or granite, along with a fine aggregate such as sand. The cement, commonly Portland cement, and other cementitious materials such as fly ash and slag cement, serve as a binder for the aggregate. Various chemical admixtures are also added to achieve varied properties. Water is then mixed with this dry composite which enables it to be shaped (typically poured) and then solidified and hardened into rock-hard strength through a chemical process known as hydration. The water reacts with the cement which bonds the other components together, eventually creating a robust stone-like material. Concrete has relatively high compressive strength, but much lower tensile strength. For this reason is usually reinforced with materials that are strong in tension (often steel). Concrete can be damaged by many processes, such as the freezing of trapped water.

Gareth Emery (born 18 July 1980 in Southampton, England) is an English/Welsh Trance producer and DJ. Since 2009 he has been the highest ranked British DJ in DJ Magazine's annual Top 100 poll, peaking at #7 in 2010.

Gareth Emery was born in Southampton, England although he also has Welsh heritage. He lived in Southampton until the age of 26 before relocating to Manchester, England where he has a studio and runs a club night and record label, both called Garuda. He has a degree in Politics from University of Warwick, supports Southampton Football Club, and is trained in classical piano. Prior to becoming involved in electronic music he played guitar in a punk band in the mid-nineties.

Emery has a distinctive and unique production style that has been described as a fusion of trance, house and progressive, and is described by Emery himself as ‘simple but effective’. Although usually categorised as a trance DJ, he has often dismissed this label simply stating that he plays good records regardless of genre.

Robert Joseph "Bob" Vila (b. June 20, 1946) is an American home improvement television show host known for This Old House (1979–1989), Bob Vila's Home Again (1990–2005), and Bob Vila (2005–2007).

Vila, a Cuban American native of Miami, Florida, received a Bachelor degree in entomology from the University of Florida in 1969. After graduating, he served as a volunteer in the Peace Corps, working in Panama from 1971 to 1973.

Vila was hired as the host of This Old House in 1979 after receiving the "Heritage House of 1978" award by Better Homes and Gardens, for his restoration of a Victorian Italianate house in Newton, Massachusetts. On This Old House, Vila appeared with carpenter Norm Abram as they, and others, renovated houses. In 1989 he left the show under controversial circumstances. Some cite the reason as being a series of conflicts with This Old House executive producer Russell Morash arising from his involvement with outside commercial endorsements, while others cite a specific instance- Vila's commercial work for New Jersey-based Rickel and the subsequent retaliatory pulling of underwriting from Rickel's competitor Home Depot and lumber supplier Weyerhaeuser- as the reason behind his departure. He was replaced by Steve Thomas.

Laurent Garnier (also known as Choice), (born 1 February 1966, Boulogne-sur-Seine, France) is a French techno music producer and DJ. Garnier began DJ-ing in Manchester during the late 1980s. By the following decade, he had a broad stylistic range, able to span deep house, Detroit techno, trance and jazz. He added production work to his schedule in the early 1990s, and recorded several albums.

During the late 1970s, Garnier discovered clubbing with his brother in Paris, where his family lived. He loved disco but also listened to all other contemporary musical genres including reggae, funk, and punk. At the age of 16, Garnier had started recording and mixing music on tape recorders.

In 1984, Garnier started working as a waiter for the French Embassy in London. He stayed there for a year and a half before moving to Manchester in 1986. Living in England he discovered the booming UK house scene and started DJing.

In 1987, he discovered the The Haçienda in Manchester, and met Mike Pickering the resident DJ. Chicago house and Detroit techno became popular, and Garnier started mixing there under the name of DJ Pedro.