Researchers believe 700-year-old teeth point to what is now Kyrgyzstan
                                
                                
                                    (Newser) -
                                    Researchers say  they've discovered "when and where the single most notorious and infamous killer of humans began." They're referring to the Black Death, or bubonic plague, which is  thought to have wiped out  tens of millions of people in Europe, Asia, and North Africa during...