Each person has an average of 100 trillion cells, each of which contains a DNA molecule. Just one of these contains information regarding 3 billion different subjects, enough information to fill approximately 1,000 volumes of books, each one containing 1 million pages. If we were to lay these pages out side by side, they would stretch from the North Pole to the Equator. If we were to read it 24 hours a day, it would take 100 years to finish it. This glorious information belongs to a single DNA molecule, which exists everywhere in our body, such as in a single fingernail or a single hair.