Topics covered include Astronomy, Nature, Research & Development, and many other fields of study themed on the science of the natural world. In many ways, math is closely related to science. Mathematics is such a useful tool that science could make few advances without it. However, math and standard sciences, like biology, physics, and chemistry, are distinct in at least one way: how ideas are tested and accepted based on evidence. Mathematics reveals hidden patterns that help us understand the world around us. Now much more than arithmetic and geometry, mathematics today is a diverse discipline that deals with data, measurements, and observations from science; with inference, deduction, and proof; and with mathematical models of natural phenomena, of human behaviour, and of social systems. The physical world and everything in it (such as plants, animals, mountains, oceans, stars, etc.) is not made by people. : the natural forces that control what happens in the world. : the way that a person or animal behaves: the character or personality of a person or animal.