Book excerpt: The term Cosmism was introduced by Tsiolokovsky and other Russian Cosmists around 1900. Goertzel's "Cosmist Manifesto" gives it new life and a new twist for the 21st century. Cosmism, as Goertzel presents it, is a practical philosophy for the posthuman era. Rooted in Western and Eastern philosophy as well as modern technology and science, it is a way of understanding ourselves and our universe that makes sense now, and will keep on making sense as advanced technology exerts its transformative impact as the future unfolds. Among the many topics considered are AI, nanotechnology, uploading, immortality, psychedelics, meditation, future social structures, psi phenomena, alien and cetacean intelligence and the Singularity. The Cosmist perspective is shown to make plain old common sense of even the wildest future possibilities.