Tooth from Laotian cave sheds light on enigmatic extinct humans NBC NewsCave discovery in Laos could unlock more about human evolution's biggest mystery CNNAn ancient tooth found in a cave proves an extinct species of archaic humans lived in southeast Asia over 130,000 years ago Yahoo NewsResearchers Find Tooth in Cave That May Belong to Extinct Human Group VICETooth of an Ancient Girl Fills Gap in Human Family Tree The New York Times