There are eight common blood types. Keyword there? Common. If what you know about blood stops right around there, then this is all going to escalate very quickly. There are literally millions of varieties of blood types, and the rarest one is shared by fewer than 45 people on Earth. Talk about exclusive.
Easy As A, B, O
There's Rare, Then There's Rhare
Why Do We Have Different Blood Types?
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Key Facts In This Video
Blood types were discovered in the 20th century. 00:17
Red blood cells contain millions of antigens that determine your blood type. 00:43
People with positive blood types have an additional antigen in their blood cells called the Rh factor. 01:10
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