Leatherback Trust To achieve this, the Park trained former poachers as eco-tour guides. Those guides now take tourists to see nesting sea turtles. Las Baulas National Marine Park now hosts guided sea turtle tours over the entire leatherback sea turtles nesting season, spanning from October until March. The Leatherback Trust played a key role in supporting the government of Costa Rica in compensating landowners for property that was within the national park. Owners cannot build or otherwise disturb that land so it is reasonable that they receive fair compensation for the land, which then becomes part of the Park. The Leatherback Trust
History of manifolds and varieties History of manifolds and varieties The study of manifolds combines many important areas of mathematics: it generalizes concepts such as curves and surfaces as well as ideas from linear algebra and topology. Certain special classes of manifolds also have additional algebraic structure; they may behave like groups, for instance. In that case, they are called Lie Groups. Alternatively, they may be described by polynomial equations, in which case they are called algebraic varieties, and if they additionally carry a group structure, they are called algebraic groups. The term "manifold" comes from German "Mannigfaltigkeit," by Riemann. In English, "manifold" refers to