Suppose you’re a trolley car driver driving in sixty miles an hour. Far ahead in the foggy mist, you see five people working on the railroad, but the trolley car’s break is broken. Then you suddenly see a sidetrack that can spare the five, but you realize that another man is working on the sidetrack. Would you do nothing and just crush those five, or would you rather turn to avoid killing those five, but sacrifice the one?This New York Times bestseller I read will give you some hint to this riddle. The author is a professor at Harvard University. His book had more than I thought, but somehow it never overwhelmed me. It will be the perfect “philosophical info-feeder” that will never become boring. This book is obviously written for college students, so some parts may not be understood crystal-clear until you’ve read it multiple times, but it will give a full “lecture” of morality and give you a full sense of what you shall do in your everyday situations.