What makes it so unique?

After being unaccountably neglected for centuries by the medical profession, it is once more recognized for what it is - a most extraordinary organ. What makes it so unique? It has a number of claims, amongst which it is the body’s master chemist, as well as the fuel storage and supply office, housekeeper, and poison control center. In its unspectacular way it is about as hard-working an organ as we have. It performs hundreds of functions 24/7.