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And this final note which may rekindle your interest in bitcoin.

From the Wall Street Journal: money is even dirtier than your mother told you it was. The Dirty Money Project at NYU conducted what's called the first comprehensive study of DNA found on dollar bills.

And found the bacteria that causes acne, other bacteria linked to gastric ulcers, pneumonia, food poisoning and staph infections. They also discovered extremely minute traces of anthrax and diphtheria, and DNA from horses, dogs, and white rhinos.

Follow Kai Ryssdal at @kairyssdal