(found on Google Images)
Cylinders are a type of three-dimensional shape that is more or less a bar. There's also graduated cylinders, which are cylindrical glass containers that have measuring marks on them. These are commonly used in labs and such. They are among a scientist's best friends (watch out for the ones that didn't graduate).
They are designed to allow someone to precisely measure liquids for experiments. They are much like a cook's liquid measuring cup in this regard. Without these, experiments would more often than not end up going awry in many frightening ways, something to be avoided. And this was possibly the most useless blog entry ever (really, everyone knows this stuff).
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