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Optical Illusion: Tracking the trajectory of a curveball

In baseball, a good curveball can turn a hitter's legs to jelly, traveling on a devastating arc that causes him to wave his bat awkwardly at where the baseball used to be. In science, a good curveball can tell researchers a lot about the differences between what a person sees when an object is viewed via the eye's narrow band of central (or foveal) vision, compared with what the object looks like when spotted through one's peripheral vision.
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