That's because light has a wavelength that is fairly small compared to items we can see - the wavelength of visible light is a bit less than a micron (1/1000 millimeter).
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It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
All of them since, by definition, they are part of daily life!
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ordainay differential eq in daily life plzzzzzzzzzzz tell me