sentences:  The number 28 was chosen to reflect the 28 million Africans who had HIV in 2007, according to UNAIDS.Nolen spent six years traveling through Africa to gather the stories.The stories range from orphans, a truck driver, a miner, and a grandmother raising her grandchildren alone in poverty, to college educated patients, military members, clergy, and even Nelson Mandela, whose son Makgatho died of AIDS.