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Scientist comes from the Latin root scientia, which means knowledge or understanding, and generally refers to one who helps build an organized system of thought about the nature of the world. Scientists study natural phenomena using disciplined and systematic methods. Through logical and objective application of these methods, they gain understanding about living or nonliving things, and often work to improve the human condition through careful application of what is known. Their work covers an enormous range of fields. The National Institutes of Health listed more than 125 major science careers. The huge range of careers is categorized into two major branches that vary depending on the source but generally include the natural sciences (study of living and nonliving things), and the social sciences (study ...

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