I lost the upper phalanx of one of my thumbs when I was 6 years old in an accident. They could not attach it and never grew back. 10 years later I read about a

I lost the upper phalanx of one of my thumbs when I was 6 years old in an accident. They could not attach it and never grew back. 10 years later I read about an American scientist that managed to grow back full body parts using some kind of pigs but extract... I wish that science was more advanced.