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The metric system can be confusing.
30 is hot20 is nice10 is cool0 is ice
In the medical field, it's all metric. My gripe is when I ask a parent how much their child weighs, and then have to convert. In the US, our official system has been metric since 1865, but we're too stubborn to follow this edict.
I find it funny that the Americans are the ones stuck using the old British system. It is as if they are having troubles letting go of their colonial roots.