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"By having a bulge in the midsection like some middle-aged man, it holds the bulk of its volume there. But where the bottom of the meniscus meets the volume-marker, it is extremely thin. This is deliberately done since any extra amount of liquid will have little room to spread horizontally and will rise instead. "

http://www.science20.com/chemical_education/subtleties_volumetric_pipet-79628

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