The Wonders of Life is a book on the philosophy of biology by the world-famous scientist Ernst Haekel. In this book, Haekel further experiments with applying the philosophy of monism to the science of biology — an effort he started in his book The Riddle of the Universe. Monism teaches that all the existing things have a common origin and are just different aspects of a uniform source. The book regards different unities and forms of life, how life is created and which laws it abides by.