Observation, When something is noticed, Hypothesis, A possible explanation for an observed event, Experiment, Designed to test a hypothesis, Data, The measurements, observations or information gathered from experiments, Theory, A hypothesis that has been supported by many different experiments, Principle or Law, Arises from a theory that has been shown to be valid when fully tested over a long period of time, Variable, Something that may change in an experiment, Replicate, Repeat of an experiment, Double blind testing, Both the investigator and the subject are unaware of who gets the drug (or who gets the placebo), Ethics, Whether conduct is right or wrong.

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