Book excerpt: Instant coffee was invented during the Civil War for use by Union troops, who hated it; holding races between lice was a popular pastime for both Johnny Reb and Billy Yank; 13% of the Confederate Army deserted during the conflict. These are three of the hundreds of bits of knowledge that Mike Wright makes available in his informative and entertaining What They Didn't Teach You About the Civil War, which focuses on the lives and ways of ordinary soldiers and of those they left behind.