I’ve always wondered why someone hasn’t invented a synthetic blood, yet.
Your kidding right? Why haven’t they found a way to cure Sickle Cell Anemia for starters? That should be easy. Life is in the blood. Millions of variables - pure science fiction magical thinking that humans could create something like synthetic blood that would be viable in real life.
A fake human appearing machine using oil or some liquid is as close as we’ll ever get I think.