I found the book absolutely fascinating, especially since I am a mechanical engineer by education and experience. To Engineer is Human covers some of the greatest engineering disasters in modern times such as the Tacoma Narrows bridge collapse, the Kansas City Hyatt Regency Walkways collapse and the Space Shuttle Challenger disaster.
Henry Petroski explains the engineering disaster in great detail and then explores the causes and effects. He then explores how (if possible) the disaster could have been avoided.
Well written and understandable this book is a masterpiece. One of the primary things that all good engineers do is to contemplate the "lessons learned" after any significant endeavor...whether it has good or bad results. As the old saying goes: Those who don't learn from history are doomed to repeat it!
Engineers as well as anyone else who has an interest in engineering marvels and what can go wrong will find this book entertaining, informative and well researched.