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  Physicist

  A physicist is a scientist who does research in physics. Physicists study a wide range of physical phenomena in many branches of physics spanning all length scales: from sub-atomic particles of which all ordinary matter is made (particle physics) to the behavior of the material Universe as a whole ...
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  Astronomer

  An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies. Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
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  Biologist

  A biologist is a scientist devoted to the study of living organisms and their relationship to their environment. Biologists involved in basic research attempt to discover underlying mechanisms that govern how organisms work. Biologists involved in applied research attempt to develop or improve...
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  Microbiologist

  A microbiologist is a scientist who works in the field of microbiology. Microbiologists investigate the growth and characteristics of microscopic organisms such as bacteria, algae, or fungi. Most microbiologists specialize in environmental, food, agricultural, or industrial microbiology; virology ...
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  Scientist

  A scientist, in a broad sense, is one engaging in a systematic activity to acquire knowledge. In a more restricted sense, a scientist is an individual who uses the scientific method. The person may be an expert in one or more areas of science. This article focuses on the more restricted use of the...
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  Chemist

  A chemist is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties such as density and acidity. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms....
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  Businessperson

  A businessperson (also businessman, business man, or businesswoman) is someone involved in a particular undertaking of activities, commercial or industrial, for the purpose of generating revenue from a combination of human, financial, and physical capital. An entrepreneur is an example of a...
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  Physician

  A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments. They may focus their practice on certain...
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  Singer

  A singer is a person who uses his or her voice to produce music. Singers are often accompanied by musicians and instruments, while other people sing to have fun. Vocal skill is usually a combination of innate talent and professional training. Singers are also referred to as vocalists. A lead singer...
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  Musician

  A musician usually plays a musical instrument, especially as a profession. It may or may not be the person's profession. Musicians can be classified by their roles in performing music and writing music. It's also a person who makes music a profession, anyone (professional or not) who's skilled in...