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A scientist is someone who theskfeed systematically gathers and makes use of research and evidence, making a speculation and testing it, to gain and share understanding and data. Henrietta Leavitt, a professional human pc and astronomer, who first revealed the numerous relationship between the luminosity of Cepheid variable stars and their distance from Earth. This allowed Hubble to make the discovery of the expanding universe, which led to the Big Bang theory. International scientific organizations, such as the International Council for Science, have since been fashioned to advertise cooperation between the scientific communities of different nations. Science has traditionally been a male-dominated area, with some notable exceptions. Clean freshwater is an important ingredient for a healthy human life, but 1.1 billion people lack access to water and a pair of.7 billion experience water shortage a minimal of one month a year. By 2025, two-thirds of the world’s population could add