Origins of Hutu, Tutsi and Twa of neighboring people, it was almost non-existent among Rwandan Tutsi. Presence of the sickle cell trait is evidence of survival in the presence of malaria over many centuries, suggesting differing origins. Regional studies of the ability to digest lactose are also supportive. The ability to digest lactose among adults is widespread only among desert-dwelling nomadic groups that have depended upon milk for millennia. Three quarters of the adult Tutsi of Rwanda and Burundi have a high ability to digest lactose, while only 5% of the adults of the neighboring Shi people of eastern Congo can. Among Hutu, one in three
Hutu Power Front (RPF) invasion, Habyarimana turned to inflaming ethnic tensions. Hutu Power acquired a variety of spokesmen. Hassan Ngeze, an entrepreneur recruited by the government to combat the Tutsi publication "Kanguka", created and edited "Kangura", a radical Hutu Power newsletter. He published the "Hutu Ten Commandments", which included the following: "Radio Télévision Libre des Mille Collines" broadcast radio shows suggesting the end to toleration of the Tutsi, repeating the Hutu Ten Commandments, and building support for the Hutu Power ideology. Two main voices of RTLM were announcers Valérie Bemeriki and Georges Ruggiu. The repetition of Hutu Ten Commandments was an attempt