About
The Riddle of the Universe is the philosophical work of Ernst Haeckel, eminent biologist, in which he explores the meaning of life, the nature of reality, and the connection between physiology and thought. (Summary by A. Gramour)
Source and licence
This work is public domain or openly licensed. The licence terms are published by the source.
How do I open it?
Use the Shopy 101 app to download it or read it in place. Anything you add to your library stays the same on every device.