Chacham writes "The Financial Times has an article about the US adding colors to some denominations of US currency. Apparently, with both size and color the same, foreigners have a hard time differenciating between the bills.I still haven't gotten used to the larger pictures. And now this? As Kermit the frog sang, It's not easy being green." The Federal Reserve has a press release. At least there's no mention of RFID tags.