At only eights years-old, Zion Harvey is the youngest person with a double hand transplant ever. Four teams of surgeons worked over 11 hours to complete the complicated operation. Zion lost both of his hands and feet when he contracted sepsis at age two and experienced multiple organ failures. When he was four, he received a kidney transplant from his mother, and leg prosthetics have enabled him to engage in many activities.

This is what an eye looks like after keratoprosthesis: a surgical procedure where a diseased cornea is replaced with an artificial cornea.

Vitamin K is a fat-soluble vitamin necessary mainly for the formation of blood clots. Without this vitamin, bleeding would not stop. 

Vitamin K is given as an injection to newborns to prevent vitamin K deficiency bleeding, since the level of blood clotting factors of newborn babies are roughly 30–60% that of adult values. The reason for this discrepancy is due to poor transfer of the vitamin across the placenta, and thus low fetal plasma vitamin K.

Occurrence of vitamin K deficiency bleeding in the first week of the infant's life is estimated at 0.25–1.7%, with a prevalence of 2–10 cases per 100,000 births. Since the vitamin is found in human milk and supplemented in infant formula, the concentration of vitamin K naturally rises within th ...