"Back to Methuselah: The Metabiological Pentateuch" is a philosophical treatise and work by George Bernard Shaw, in which the author explores the concept of human life, its origin and purpose. Interweaving scientific fact and fantasy, Shaw examines questions of human evolution, longevity, morality, and transcendence through allegory and dialogue. The book is a complex and extremely in-depth work that causes the reader to think and reflect on the essence of life and human existence.