Brain Rules for Baby by John Medina, because it made me a better father; Why We Sleep by Matthew Walker, because it taught me of the importance of something that I’d occasionally dismiss as a nuisance; Pain Free and Pain Free at Your PC by Pete Egoscue, because it completely changed the way I understood posture, pain, and how repetition influences my body; and Letters to a Young Poet by Rainer Maria Rilke, because it…
But there's just something about Frankl's descriptions, at least for me. It personalized it in a way I had never really experienced before. That book horrified me in a way that none of the other material on the holocaust ever had.