Melanin
03 Mar 2008Also called pigment, melanin is a substance that gives the skin and hair its natural color. It also gives color to the iris of the eye, feathers, and scales. In humans, those with darker skin have hig...
The Hippocratic oath was an oath generally thought to be written in the 4th century BCE by Hippocrates, who is considered by many to be the founder of modern medicine. Some now question Hippocrates' a...