Human blood already comes in a bewildering variety of types, but researchers have now identified a new one so rare that only three people on the planet are known to carry it. The finding exposes just ...

There are rare blood types beyond the eight most common ones, and researchers have discovered one more that brings the total count to 49. Blood type A(B) is caused by a four gene mutations and was ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. There’s more history in your blood types than you think, ...

Across life on Earth, blood comes in blue, green, purple, even clear. But why? And what makes your blood different from mine? This is the strange world of blood—what it does, why it varies, and why we ...