There are many patients and people in the world who are in need of blood. Blood donors play a poignant role in saving lives at any point in time. A significant point to be aware is that people with blood group O are universal blood donors and can donate blood to anyone. Any healthy individual 17 years and beyond can donate blood. Normally, blood takes just 24 hours to replenish in a healthy person. On World Blood Donor Day, let us donate blood to the needy and save precious lives.