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One of the 3 biggest oversights the U.S. made at, or near, its beginning was not to adopt the metric system

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How can you feel, or sense,

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1,000,000  ?

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For more, use the DOOR.

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   A meter is a bit longer than a yardstick (39+ inches). Picture, then a square 1 meter long and 1 meter high.

   Having done that, consider this disgusting example:

   (1)  The long cigarette. It’s exactly 100 millimeters long (that’s 100 mm).

   (2)  Imagine 10 long cigarettes end to end. It would be 1 meter long.

   (3)  It’s also 1000 mm long.

   (4)  Imagine 10 cigarettes going straight up. (You could draw this on a piece of paper or chalk board.)

   (5)  This new “square meter” would measure 1000 mm by 1000 mm (or, of course, 100 cm by 100 cm, or 10 dm by 10 dm, or 1 m by 1 m).

   (6)  If you “drew in” all the mm lines, you would have 1,000,000 sq. mm. There’s your “million.”

   (For some more scraps of thinking here, step–carefully–below the line.)

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    Be aware that “sq. mm” is perhaps better written as mm². A cubic millimeter, “cu. mm” would be mm³. Going the other way, a cubic centimeter, or “cu. cm”, would “cm³” which is the same thing as a cc or ml (or milliliter–with no superscripts, by the way). And…1000 ml equals 1 liter, or 1L. Be aware that most countries will spell “meter” as “metre.” Also metric symbols do not take periods.

   Don’t try any of this with inches, feet, yards, quarts, and other English, “Customary,” or antiquated units, or you’ll soon go nuts.