Question: What’s the rarest human blood type?
Answer: Rhnull, known as “golden blood,” is so rare that fewer than 50 people on Earth have ever been reported to have it. The biological complexities of why it’s so rare is explained at the link above, but the simplified answer is that it’s a blood type with no Rh antigens. That makes it a universal donor for anyone who needs blood, giving it enormous life-saving capability.
