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{adj: experimental, data-based, observational} relying on observation or experiment
"experimental results that supported the hypothesis"

{n: event} a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory

{n: natural history} the scientific study of plants or animals (more observational than experimental) usually published in popular magazines rather than in academic journals

{n: subject, case, guinea pig} a person who is subjected to experimental or other observational procedures; someone who is an object of investigation
"the subjects for this investigation were selected randomly"
"the cases that we studied were drawn from two different communities"

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