April 18, 2014.

Why You Shouldn't Put Your Money Where Your Mouth Is

The chinless man obeyed. His large pouchy cheeks were quivering uncontrollably. The door clanged open. As the young officer entered and stepped aside, there emerged from behind him a short stumpy guard with enormous arms and shoulders. He took his stand opposite the chinless man, and then, at a signal from the officer, let free a frightful blow, with all the weight of his body behind it, full in the chinless man’s mouth. The force of it seemed almost to knock him clear of the floor. His body was flung across the cell and fetched up against the base of the lavatory seat. For a moment he lay as though stunned, with dark blood oozing from his mouth and nose. A very faint whimpering or squeaking, which seemed unconscious, came out of him. Then he rolled over and raised himself unsteadily on hands and knees. Amid a stream of blood and saliva, the two halves of a dental plate fell out of his mouth.

Talk about dirty money: Scientists are discovering a surprising number of microbes living on cash.

The prisoners sat very still, their hands crossed on their knees. The chinless man climbed back into his place. Down one side of his face the flesh was darkening. His mouth had swollen into a shapeless cherry-coloured mass with a black hole in the middle of it.

In the first comprehensive study of the DNA on dollar bills, researchers at New York University's Dirty Money Project found that currency is a medium of exchange for hundreds of different kinds of bacteria as bank notes pass from hand to hand.

From time to time a little blood dripped on to the breast of his overalls. His grey eyes still flitted from face to face, more guiltily than ever, as though he were trying to discover how much the others despised him for his humiliation.

By analyzing genetic material on $1 bills, the NYU researchers identified 3,000 types of bacteria in all----many times more than in previous studies that examined samples under a microscope. Even so, they could identify only about 20% of the non-human DNA they found because so many microorganisms haven't yet been cataloged in genetic data banks.