<P> Big Brother is a game show in which a group of contestants, referred to as HouseGuests, live in a custom - built "house" (actually a set built on a CBS stage in Los Angeles, Stage 18 since season 6), constantly under video surveillance . While in the house, the contestants are completely isolated from the outside world, meaning no phone, television, Internet, magazines, newspaper, or contact with those not in the house . This rule could be broken, however, in the event of a medical injury, a family emergency, or death . The format of the series is mainly seen as a social experiment, and requires HouseGuests to interact with others who may have differing ideals, beliefs, and prejudices . While a competition, the series allows viewers to witness the relationships formed in the house and the behavior of the HouseGuests . Though locked in the house, the HouseGuests are free to quit the game, though will not be allowed entry back into the house . Should a HouseGuest break the rules of the game, they could be expelled from the house, and unable to return . The contestants compete for a grand prize of $500,000 . </P> <P> The premiere season used the original format of the series, which originated in the Netherlands . HouseGuests were required to nominate two of their fellow contestants for potential banishment, and the two with the most votes would be nominated . Should multiple HouseGuests receive the most nominations, then more than two HouseGuests were marked for banishment . This process was mandatory for all HouseGuests, and failure to comply could result in expulsion from the house . The HouseGuests in these seasons were forbidden from discussing nominations, and doing so could result in punishment . The public, through a vote conducted by phone, would vote to banish one of the nominated HouseGuests from the house, and the HouseGuest with the most votes from the viewers would be banished from the house . When only three HouseGuests remained, the viewers would vote for which of them should win the series, and the HouseGuest with the most votes would become the winner . The format, during that season, was plagued with a negative reception from both critics and viewers . </P> <P> Having spent millions on the series, CBS issued a second season of the series and announced that various changes would occur with the format . The current format of the series is focused more on competition and strategy than the original series, which makes resemblance to the format from another CBS show, Survivor . At the start of each week in the house, the HouseGuests compete for the title of Head of Household . The Head of Household for each week is given luxuries such as their own personal bedroom and free laundry service, but is responsible for nominating two HouseGuests for eviction . The Head of Household would not be able to compete in the following week's Head of Household competition, meaning that a HouseGuest could not hold the title for two weeks in a row, except for the final week or other stated circumstances . All HouseGuests excluding the Head of Household and nominees later vote to determine which of the two nominees should be evicted, and the nominated HouseGuest who received the most votes is evicted during a live episode . If there is a tie in the voting, the reigning Head of Household is required to make the tie - breaker decision . Unlike other versions of Big Brother, the HouseGuests may discuss the nomination and eviction process openly and freely . The HouseGuests also competed in Have - Not competitions, in which the losers were required to solely eat slop for the rest of the week, as well as sleep in a special bedroom . Upon reaching a point in the game, the evicted HouseGuests go on to become members of the Jury; the Jury is responsible for choosing who wins the series . The members of the Jury are not shown any Diary Room interviews or any footage that may include strategy or details regarding nominations . Once only two HouseGuests remain, the members of the Jury cast their votes for who should win the series . </P> <P> To keep the series intriguing, each season typically features a new twist to change the format of the game . This began with Big Brother 3 (2002) and the "Expect the Unexpected" twist . Other seasons feature smaller twists that have a smaller impact on the game, usually affecting that sole week . The most notable example of this is Pandora's Box, a twist that originated in Big Brother 11 (2009). The twist sees the current Head of Household for that week being tempted by the box, and can choose to either open the box or leave it . Should a HouseGuest choose to open Pandora's Box, both good and bad consequences could be unleashed into the house; these can affect not only the Head of Household but the other housemates . Similar formats are applied in later seasons, for example, the Den of Temptation introduced in season 19 . Secret powers have also appeared in the past . Mike Malin was the first HouseGuest to receive a secret power, earning the Coup d'État during Big Brother: All - Stars (2006). The Coup d'État allowed the holder to remove one or both nominees from the block on eviction night, as well as choose who is nominated in their place . Malin chose not to use the power, and it subsequently returned during Big Brother 11 (2009) when Jeff Schroeder was given the power by the viewers . Matt Hoffman was given a Diamond Power of Veto during Big Brother 12 (2010), which allowed him to remove one HouseGuest from the block and choose the replacement nominee . During Big Brother 14 (2012), HouseGuest Ian Terry won a second Power of Veto, which could be used the same as the normal Power of Veto . </P>

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