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Results from the Mars Exploration Rovers Spirit and Opportunity suggest that liquid water
Purity
The quality or state of being free from contamination, adulteration, or imperfection; often associated with moral or ethical cleanliness.
Wavelength
The gap between one peak of a wave and the next, particularly in sound waves or electromagnetic waves.
Subliminal
Pertaining to stimuli or psychological processes that occur below the threshold of conscious awareness.
Below Threshold
Refers to stimuli that are too weak in intensity to evoke a perceptible response or awareness.
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