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A lunar eclipse may occur
Happiness
A state of well-being and contentment characterized by positive emotions ranging from satisfaction to intense joy.
Smiling
is a facial expression formed by flexing the muscles at the edges of the mouth, typically signaling joy, amusement, or sociability.
Variable
A characteristic, number, or quantity that can change or vary, often used in research to measure and analyze differences or effects.
Experimental Group
A group in a scientific study that receives the treatment or intervention being tested, allowing researchers to measure the effect of the treatment.
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