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Scientist studies about science. Science is the study of everything around us, meaning that scientist study everything around us. It comes from to words, science and the suffix -tist, science, the study of facts or truths, and -tist, a person who does an action. When we combine the words, it forms scientist, a person who study facts or truths systematically arranged, learning trough experimentation and observation.
The work of the scientist is to explore something or to make inventions and to study about our science. :)