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Cover figure: A Brownian-motion experiment images micron-sized polystyrene sphere beads: (a) Schematic diagram; (b) image taken at 100X magnification; (c)-(d) processed image and bead positions over time; (e) histogram of displacement data for many beads; (f) mean-squaredisplacement vs. time for many particles. See the article on page 485 to learn how these data can be used to determine the diffusion coefficient. Read article
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