This rarest of blood types is defined by an unusual Rh factor that is neither negative nor positive ... Specifically, this ...

I f you can't quite remember what your blood type is -- don't worry. That just means you're among the 33% of Americans who ...

People with type O blood enjoy a slightly lower risk of heart disease and blood clotting, but they may be more susceptible to hemorrhaging or bleeding disorders. This may be especially true after ...