In Ancient Egypt, the royal cubit was based on the length of the distance from the elbow to tip of finger of the current emperor.
Look at all they accomplished.
Given the fact that we change leaders either every 4 or 8 years except in certain circumstances, we have the opportunity to change and evolve at an incredible rate. If we don't evolve, we atrophy.
I propose, that as the current president is sworn in, the length of his or her elbows to fingers is cast into a rod, known as the presidential cubit.