Why are there so many different blood types?

TheVerge

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Do you know your blood type? If you haven’t been in any medical situations where blood type is important, you might not. I certainly don’t, even though I’ve been fascinated with blood since I was a sophomore in high school.

That year, I was diagnosed with Type 1 diabetes. That meant, among many things, that I had to make myself bleed nearly every day as I monitored my blood sugar levels through a finger prick. (I now wear a monitor with an under-skin sensor that continuously checks my blood sugar, saving my fingers from so many pricks.) So when that same year, I learned how to use microscopes in science class, curiosity got the best of me: I took some of my blood and placed it under the microscope. The choreography of red and white blood...

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