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What percentage of the world's sickness is caused by water-borne diseases?
Moon Illusion
The moon illusion is an optical illusion where the moon appears larger when it is close to the horizon than when it is higher in the sky, despite having the same actual size.
Horizon
The line at which the earth's surface and the sky appear to meet, or metaphorically, the limit of a person's knowledge, experience, or interest.
Elliptical
Having an oval shape or relating to an ellipse; also used metaphorically to describe speech or writing that is obscure or lacks completeness.
Perceptual Constancy
The brain's ability to perceive objects as unchanging despite changes in viewing conditions, such as distance or lighting.
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