If you had a negative value you'd have had problems making a baby.(it could have been born with different diseases such as malformations or parkinson)
So be glad you're not ^_^.
Because I want all -O blood types to send me a pint of their blood so I can get wasted on O blood....:shrug:
Dunno dude,I think it's interesting to see how many variants we have and whats most common here.
Also, It's fascinating how many people don't know their blood types. People should know.