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2. Costa Rica - Wikipedia

   en.wikipedia.org/wiki/Costa_Rica

   Learn about Costa Rica, a Central American country with a rich and diverse heritage, a stable democracy, and a high human development index. Explore its history from pre-Columbian times to independence, its geography from coasts to mountains, its culture from languages to education, and its economy from agriculture to services.

3. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems for various sciences and mathematics itself. It involves the description and manipulation of abstract objects using pure reason and proofs, and has many areas such as number theory, geometry, algebra, calculus, and set theory.

4. Ancient Egyptian mathematics - Wikipedia

   en.wikipedia.org/wiki/Ancient_Egyptian_mathematics

   Learn about the history, sources and features of mathematics in ancient Egypt. The earliest extant mathematical text from Egypt is the Moscow Mathematical Papyrus, dating to the 12th Dynasty (c. 1990–1800 BC).

5. Cerro Chirripó - Wikipedia

   en.wikipedia.org/wiki/Cerro_Chirripó

   Cerro Chirripó is the highest mountain in Costa Rica, with an elevation of 3,821 meters (12,536 feet). It is part of the Cordillera de Talamanca , and the range's highest point. It is located in Chirripó National Park and is noted for its ecological wealth.

6. Srinivasa Ramanujan - Wikipedia

   en.wikipedia.org/wiki/Srinivasa_Ramanujan

   Learn about the life and achievements of Srinivasa Ramanujan, an Indian mathematician who made groundbreaking contributions to number theory and analysis. Find out how he developed his own mathematical research in isolation, corresponded with G. H. Hardy, and died at a young age.

7. Calculus - Wikipedia

   en.wikipedia.org/wiki/Calculus

   Calculus is the mathematical study of continuous change, developed by Isaac Newton and Gottfried Wilhelm Leibniz in the 17th century. The article traces the origins and precursors of calculus in ancient Egypt, Greece, China, India, and medieval Europe.