Last week’s season finale of The Knick saw the cocaine-addicted Dr. John Thackery try to solve the mystery of blood types before another doctor could do it. I won’t spoil what happened for you here, ...

The Rh factor is a type of protein that's usually found on red blood cells. When you have this protein, you’re considered Rh positive. About 85% of people are Rh-positive. The rest are Rh-negative.

A Word of Caution: This calculator should NOT be used for Paternity testing. Sometimes blood grouping inheritance can be flawed due to mutations and give false conclusions and for these reasons we ...