Most photographers know that aperture affects the depth of field. (Small aperture = sharp image; large aperture = blurry image.)
This video gives a simple, non-mathmatic, explanation.
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Follow up video: "The logic behind irrational f-stops" https://youtu.be/3DbLylR04fw
Another video on DOF and sensor size: https://youtu.be/ZHa8LDDGGS8