There is an Australian man, James Harrison, who has a singularly unique blood plasma composition that has been used to cure Rhesus disease, a hemolytic disease that affects newborn babies. He has donated his blood plasma over 1000 times. | James Buchanan was the only unmarried president of the United States. | Chocolate was used as medicine during the 18th century. It was believed that chocolate could cure a stomach ache. | A rabbit is not able to vomit. | Venus is the only planet that rotates clockwise.