Jensen Beach, Florida off in order to protect the nests of the sea turtles. The three species found on this beach are the loggerhead, leatherback turtle and green sea turtle. Loggerhead nests are the most common type found on this and adjacent beaches. Locations of the sea turtles' nests are marked with the approximate date in which the eggs were laid and the expected date in which the eggs will hatch. These notifications are meant to discourage tourists and residents from visiting the beach in the evening hours during these time periods. Efforts are made to protect both species of sea turtles since
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