Microsoft study shows Nigerian scammers are carefully crafted to sift out scam-savvy targets. By announcing they are Nigerian and that they need your help to transfer millions of dollars or some such scam, the cyber crooks increase their efficiency. The paper focuses on false positives that make many promising detection technologies unworkable in practice. True positives are targets successfully attacked, while false positives are those attacks that yield nothing. Only one in 10,000 or fewer are still tricked by these money schemes.”]