Many times we forget the importance of measurement in our everyday lives. When the doctor prescribes you medicine to get you better measurement is at the fore front of their mind as well as the pharmacist that fills the prescription for you. Too much will most definitely hurt you. Too little and you will not see the health benefit. When we cook things which measurement system are we using cooking a roast at 400 degrees is great when using U.S. measurement standards, but in the Metric system you might vaporize it, if you could find an oven that even reaches those temperatures.
Units of measurement basically make the world go round. When we neglect to understand these units, we basically neglect to know the world around us.