Henning Makholm wrote:...Or transact all our business in natural units.

**That**is what I was aiming at. Most of us are caught up in definitions of elemental quantities in tems of completely relative units. Throwing all that out, as was attempted with the Hz unit, clears the air of misconceptions such as a 'light year' being somehow bound to the length of a planet's orbit, or the speed of light being being somehow tied to our derived units like the second. Even the choice of a cesium clock for a time standard is arbitrary, and the resulting definition is still some huge number that adds up to a

*second*, for pete's sake.

In terms of defining units of measurement, there would seem to be a good argument for using one of the emission lines of hydrogen (the most basic element) for a unit of frequency/time (a 'hydro-tick'), and its associated wavelength (an 'angst') for the basis of a unit of length. Thus completely stepping away from ancient and human-based things like the second. I will drive my car at 90 nano-

*c*s for a distance of (i'm not going to try to calculate this one) some-number-of giga-angsts, and get there in some-other-number-of giga-hydro-ticks.

*Now*we can communicate with those Bftsplkians.