Support this podcast: podcasters.spotify.com/pod/show/librivox1/support This book presents a brief bio and a summary of important ideas & events in the lives of 23 great philosophers from ancient times through the 19th century. The book focuses on freethinkers, who are known to say things which upset those in power, Several of these men paid for their beliefs with their lives; many others were persecuted and imprisoned for saying what they believed.