Your answer would be the Kidney
The kidney was the first organ to have an artificial replacement; the dialysis machine invented by Kolff in the 1940s.
A standard unit of measurement based on the distance to the sun is the astronomical unit.
When ignore a conflict : you make the conflict become deeper and deeper that could lead to vengeful feeling between you and that other person
When you confront a person : you may hurt that person's feeling during the confrontation and that both of you and that person could explode in uncontrollable rage
When mediate a conflict : one of the party may think that you took the other's side, which also could lead to uncontrollable anger
