Researchers use cell phone data to track movement of about 15 million people . Score: 6 Many Nairobi residents carry the malaria parasite back with them after traveling elsewhere . A child dies every minute in Africa because of malaria .
Researchers use cell phone data to track movement of about 15 million people . Using data on malaria prevalence , they can see how human travel contributes to its spread . Many Nairobi residents carry the malaria parasite back with them after traveling elsewhere . A child dies every minute in Africa because of malaria .