I think this is a book that everyone should read; we really aren't taught to critically think in school, and this would be a good place to start. It explained everything very clearly; Sagan was amazing at putting things into layman's terms, and this book was no different. As someone who is about to attend school to become an archaeologist, I definitely could use the logical fallacies and the baloney detection kit, and I know many other fields need the same tools. Another user mentioned his constant use of aliens as an example. The thing is, Sagan was an astrophysicist who dealt with all kinds of questions about aliens and government cover-ups. If he was an archaeologist, he would have mentioned Atlantis more frequently, and if he was a doctor, he would have mentioned herbal medicines and alternative medicine.