7 Fascinating Facts You Didn't Know About Blood

Victoria Kezra
Give some more thought to the red stuff keeping you alive for World Blood Donor Day

It's a bloody good time. Usually we only remember our blood when it's outside of our bodies, which is usually bad news. Time to think of blood in a more positive vein this past weekend for World Blood Donor Day. Take the opportunity to give a nod to your internal delivery system by learning a little more about it.

1. There is a small amount of gold in your blood, about .2 milligrams.

It appears to be a naturally occurring element and in fact, people have trace amounts of several metals in their bodies. Don't bother trying to extract it, your blood is worth more than the gold in it. 

2. Gorillas Nearly All Have Type B blood and none have Type A. Chimps nearly all have Type A blood and none have Type B

Why and how the blood type split between primates occurred is unknown, but it may provide a hint to our own evolution. 

3. Your blood type can change over your lifetime

It’s rare, but some things like liver or bone marrow transplants can change your blood type. The odds are about one in six billion, but if you’ve had any sort of transplant it would be best to keep an eye on that just in case. 

4. In Japan it is believed your blood type affects your personality, much like a horoscope
Type As are shy and polite, Type Bs are practical and relaxed and Type Os are outgoing and popular. Type ABs are a mix of the traits from A and B. 

5. The blood you donate is sold on the open market. It’s a $4.5 billion dollar a year industry

The Red Cross has something of a monopoly on the blood market and controls 44% of the blood supply. Don’t get too excited; by weight HP black printer ink is more expensive than blood.


6. When you look at the blue sky and see floating white dots, those are the white blood cells in your eyes.

The phenomenon is known as “blue sky sprites.” White blood cells don’t absorb light well and when the light passes through the white blood cells in the tiny blood vessels in your eyes, you can see them against the light blue background. Just take it as a sign that your eyes are nice and healthy. 


7. Every 2 seconds, someone in the United States needs blood, but less than 10% of eligible blood donors donate.

When people were asked why they don't donate, the number one reason was “Hadn’t thought about it.” Number two reason was fear of needles. 

Read More: Meet The Hero Whose Blood Donations Have Saved 2 Million Babies