A Book Concerning Long Life is a work written by Paracelsus, also known as Theophrastus von Hohenheim, a Swiss physician and alchemist who lived during the Renaissance era. The book is focused on the topic of how to achieve a long and healthy life, and it covers a wide range of subjects related to this theme.Paracelsus begins by discussing the importance of a healthy lifestyle, including proper diet, exercise, and sleep. He also emphasizes the importance...