Blood types are such a fascinating topic, especially when you dive into the rarer ones. While most people are familiar with the ABO system (A, B, AB, O), rare blood types go way beyond that. For instance, the Rhnull phenotype, often called 'golden blood,' is found in fewer than 50 people worldwide. That’s insanely rare compared to something like AB negative, which is already uncommon at around 1% of the population but still way more frequent.
Then there’s the Bombay phenotype, which lacks the H antigen—super rare in most populations but slightly more common in certain regions like India. It’s wild how genetics play out differently across the globe. I remember reading about a case where someone needed a Bombay blood transfusion, and it turned into an international search. Makes you realize how crucial blood donation is, even if you think your type is 'ordinary.'