[the long march]

All of metrology uses certain assumptions. It is a field bound by limitations on methodolgy and accuracy. When used as a tool to “prove” something it will frequently be misused. Fact is the data are the data ——interpretation is everything

[Dr. I. C. Spots]

“All of metrology uses certain assumptions”. This is a false statement. I have been in electrical calibration for over 20 years and I have never calibrated a piece of equipment based on an assumption. Calibration or metrology is simple; measuring an unknown against a known. If for example I'm going to measure resistance then I must have a STANDARD OHM to use, a unit of resistance agreed upon by national and international agencies. If you do not have a known standard than you can not calibrate that unit. If I had a customer that brought a meter to me to cal and I told him that I did not have a suitable standard but I took a good stab at it, he would demand his money back and take it to a reputable lab. Unless I have a rock that I know is 1 million years old then how can I accurately date anything to a million years? Without a known standard, anything else is guess work. The more guesses and assumptions you make the more inaccurate the result. Everyone knows what happens when you ASSUME.