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A rough surface for infrared waves may be polished for
Double-Blind Procedure
An experimental technique in which neither the participants nor the experimenters know who is receiving a particular treatment, used to prevent bias.
Random Assignment
A method used in experiments where participants are assigned to groups in a way that each has an equal chance of being placed in any group, minimizing biases.
Nonverbal Behaviors
Communication actions, excluding spoken words, that convey messages and emotions, such as facial expressions, body language, and gestures.
Singles Bars
Social venues primarily aimed at single individuals seeking to meet others for romantic or dating purposes.
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