Religion 101 (Humble)
Peter Archer
Seven Elements That Changed the World
John Browne
Socialism 101 (Humble)
Kathleen Sears
Ethics 101 (Humble)
Brian Boone
Dinosaurs Without Bones
Anthony J. Martin
Chaos: Making A New Science
James Gleick
Absolute Zero and the Conquest of Cold
Tom Schachtman
Moonshot
Brian Floca