I guess nobody wants to come out and play with this one.

can you think of another measure of wealth that would be both universally accepted and rock-solidly immutable? I think physiological constants are pretty cool. The closer we can get to a binary system (if it works you live/if it fails you die) the more realistic it would be.

What would the value be of an absolute currency? A currency that is always profoundly, immutably important.