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I still fail to see how having a standardised "hair" would help the telephone issue... why cannot they describe how the hair was cut? Then you'd know whether it vibrated or not, or whatever it is you...

I can already explain the HHT mechanics and what it is used to do to anyone who cares to ask, as I am sure is the case for anyone who has ever used or tried the test. I do not need a standardised...

"All models are wrong but some are useful."

The usefulness of any test boils down to the sources of variability, their relative magnitudes, and which ones can be controlled.

There are many...