Those who are caught bartering can end up in the "Special Housing Unit" -- an isolationarea also known as the "hole" -- and could lose credit they get for good behavior.
One camp uses an index of isolation, which measures the likelihood that two inhabitants of an area will belong to the same ethnic group, to prove the existence of ghettos in Bradford, Leicester and Oldham.
During the times of isolation, a number of species of giant duck-billed dinosaurs "roamed a much smaller area than you might think given that many were larger than elephants, " Gates said.