Ideally, a measurement should have validity, reliability, and power in order to be useful to scientists.
A scientist is someone who performs scientific study to enhance knowledge in a field of interest. There are various factors that drive scientists to work. Many people want to know how the world came to be and why it is the way it is. They display a keen interest in reality.
There was no actual ancient counterpart to a modern scientist in classical antiquity. Though Thales (c. 624-545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods, the term scientist did not come into common usage until the 19th century after it was first used. Instead, philosophers engaged in the philosophical study of nature known as natural philosophy, a precursor to natural science.
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