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Let's visit metric again.
Nixon, I believe, said we had to go metric. I-44 in Missouri even had some mileage signs in metric.
Reagan, I'm sure, nixed the whole idea.
Here's the problem for Americans, metric uses Greek and Latin prefixes:
One Meter is roughly 39 inches.
A Greek prefix mean multiply.
kilometer is 1,000 meters;
megameter is one million meters;
gigameter is one billion meters;
terameter is one trillion meters.
A Latin prefix mean divide.
centimeter is one-hundredth of meter;
millimeter is one-thousandth of a meter;
micrometer is one-millionth of a meter;
nanometer is one-billionth of a meter.
Americans, Greek, Latin <-- see the basic problem.
Plus, the prefixes mean that measurements required polysyllabic words. We don't like that. Except for 'gallon' we're used to single-syllable units of measurement.
inch, foot/feet, mile, quart, pint, pound, ton, -- even ounce is one syllable!
We'll use "liter" but only because it sound like a bunch of kittens in West Texas! :)