Science is the objective pursuit of reliable knowledge. Although one might "know" something through authority, faith, or intuition, scientific method is distinct in that it must be possible for other investigators to ascertain the truth of scientific theories. Its founded on objective observation, the formulation of hypotheses that fit the data and predict other posibilities, repeatable experiments that can fail as well as succeed, and analysis and review by the scientific community.

Mathematics is the study of numbers, sets of points, and various abstract elements, together with relations between them and operations performed on them. Originally mathematics was concerned with the properties of numbers and space, as the science of quantity, whether of magnitudes, as in geometry, or of numbers, as in arithmetic, or the generalization of these two fields, as in algebra.

This article addresses modern science, by which we mean science as we now understand it; e.g. making use of the scientific method of controlled experimental verification of hypotheses. Before the 1500s, it was typically thought that the natural world could be understood by invoking supernatural deities, or by simplistic (and sometimes, not so simplistic) theories founded on casual observation and 'common sense'

Chemistry is the branch of science concerned with the properties, structure, and composition of substances and their reactions with one another. There are two main divisions, organic and inorganic. Inorganic chemistry is concerned with the elements and all their compounds except those of carbon, which are the subject of organic chemistry. Physical chemistry studies their physical properties and structures and the relations between energy and physical and chemical change. Analytical chemistry is concerned with determining the composition of substances.

Technology is the study and knowledge of the practical applications of scientific discoveries; e.g. for the production of goods and services that improve the human condition and environment. The processes by which human beings fashion tools and machines to increase their control and understanding of the material environment. Technology is closely related to science and engineering. It includes the development of new materials, machinery, and processes that improve production and solve technical problems. Agriculture, Engineering, Radio, Space, Television, Transport