There are billions and billions of people on earth and we each have our own fingerprint that matches no one else. And, aside from identical twins, no one has our DNA. Each of us have our own personal voiceprint and retina. These are used to show our own special identity. No one can have exactly what we have. Yet, with the billions and billions of people we have only four blood types. Only four. I think it is miraculous. We can share our blood with others that cannot match us in other way. Without harming ourselves, we can give blood to save lives. It's a happy thought.
