So yesterday I went to buy lunch and got $14 in change. I noticed writing on one of the dollars but didn't pay attention to it. This morning while on BART I was getting my dollar ready to pay for my morning bagel at Boudin's. You can see in the picture what it says. It's a currency tracking project to see where this dollar has been. Interesting! Here is the link to read more about it and where you record the serial number of the dollar. I have yet to see where this dollar has been.