The life-changing forces of technology, globalization, climate change, the stunning advances in medicine and science, are reinventing what it means to be human. Three-person babies. Technology altering our brains. A cure for loneliness. Extreme biohacking. Outposts on Mars. Emerging diseases. Sex robots. The union of man and machine. Even the end of death itself. The once-immutable facts about what it means to be alive are up for grabs.