Leatherback Trust conservation initiatives throughout Costa Rica and around the world. The Leatherback Trust currently supports conservation projects for the leatherback, green and olive ridley sea turtles in Costa Rica; leatherback and loggerhead sea turtles in South Africa; loggerhead sea turtles in Greece; and hawksbill sea turtles in the US Virgin Islands. Las Baulas National Marine Park was formed by a Presidential decree in 1991 and officially confirmed by law in 1995. Prior to the creation of the park almost 100% of all the sea turtles eggs laid in the region were collected illegally (poaching), but now this has been effectively ended.
History of manifolds and varieties spaces with a differentiable or topological structure, while "variety" refers to spaces with an algebraic structure, as in algebraic varieties. In Romance languages, manifold is translated as "variety" – such spaces with a differentiable structure are literally translated as "analytic varieties", while spaces with an algebraic structure are called "algebraic varieties". Thus for example, the french word "" means topological manifold. In the same vein, the Japanese word "" (tayōtai) also encompasses both manifold and variety. ("" (tayō) means various.) Ancestral to the modern concept of a manifold were several important results of 18th and 19th century mathematics. The oldest