Everybody knows that the human body contains about 75% water by weight. But nobody has memorized how many other elements are contained in the human body. The human body also has Carbon, Calcium, Phosphorus, Potassium, Chlorine, Boron, Mercury, Arsenic, Gold, Radium, etc. The t-shirt above shows exactly what the ingredients of the human body is. Chemistry nerds will love buying this thing for $20.