Book excerpt: "Each true story in this series by outstanding authors Janet and Geoff Benge is loved by adults and children alike. More Christian Heroes: Then & Now biographies and unit study curriculum guides are coming soon. Fifty-five books are planned, and thousands of families have started their collections! Braving danger and hardship, David Livingstone crisscrossed vast uncharted regions of Africa to open new frontiers and spread the message of the gospel to all who would listen (1813-1873).