SELECT Birth_Place FROM people GROUP BY Birth_Place HAVING COUNT(*)  >=  2
What are the birth places that are shared by at least two people?
[Schema (values) (types)]: | body_builder |  body_builder : body_builder_id (text) , people_id (number) , snatch (number) , clean_jerk (number) , total (number) | people : people_id (text) , name (number) , height (number) , weight (number) , birth_date (number) , birth_place (number);