what is science.

Science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general truths or the operations of fundamental laws.

Science can be divided into different branches based on the subject of study. The physical sciences study the inorganic world and comprise the fields of astronomy, physics, chemistry, and the Earth sciences. The biological sciences such as biology and medicine study the organic world of life and its processes. Social sciences like anthropology and economics study the social and cultural aspects of human behaviour.

 

Science is further treated in a number of articles. For the history of Western and Eastern science, see science, history of. For the conceptualization of science and its interrelationships with culture, see science, philosophy of. For the basic aspects of the scientific approach, see physical science, principles of; and scientific method.

In the 1990s a popular conspiracy theory arose claiming that long-lasting contrails contained chemicals (“chemtrails”) that were sprayed by governments for purposes such as controlling the weather or dispersing drugs to influence the general population. However, atmospheric scientists have explained that some contrails last longer than others because of factors such as the humidity of the air (which can vary quite sharply over short distances) and the temperature of the airplane’s exhaust.