The nature of the geographic separation necessary to isolate populations depends entirely on the biology of the organism and its potential for dispersal.
Designed for a Paris-based family with two children, the Cubist House is located in a courtyard that encloses an urban oasis, totally disconnected from the busy, greenless street outside.
The guest arrives on a slightly raised new plaza, which features old granite stones and wrought iron columns rescued from the Old Mill. A water feature breaks down the traffic noise.
When the Supreme Court in 1954 announced the desegregation of America's schools Mr Shuttlesworth felt that he, the son of a sharecropper, stood equal in rights with any man.
More than a century after the Civil War and 16 years after the Supreme Court's school-desegregation ruling, the American black has not achieved justice or equality.
But the blaze was "nowhere near controlled" on Monday and a separate, smaller blaze south of the city was growing larger, said Mike Fischer, the county's emergency management director.
Rats can't vomit or burp because of a limiting wall between their two stomachs and their inability to control the diaphragm muscles needed for the action.
Once boys and girls were segregated, teachers resorted to traditional gender stereotypes to run their classes, and within just three years, five of the six districts had gone back to coeducation.
A high school in Henan Province is segregating students at lunchtime as a way to prevent them from developing romantic relationships that officials say would otherwise distract from their studies.