Big brother

In the TV series Big Brother, nine contestants who have never met before are challenged to stay in a house, cut off from any contact with the outside world, for 70 days. Their every move is recorded around the clock by 24 cameras. At stake is a large cash prize. The contestants are free to leave at any time, but, if they do, they walk away empty-handed. At regular intervals contestants nominate two members of the group for eviction, with viewers making the final decision as to who is to leave.