This is information we all should know, but probably don't. 

 

Blood types.

 

According to Quest Diagnostics, only about half of us know our blood type. Meanwhile, two-thirds of us know our horoscope sign. Not sure if knowing you're a Scorpio will help you at the hospital, but knowing your blood type? Yeah, that's good to know.

 

Want to learn what your blood type is? Donate blood!