These are only a few of the intriguing questions that are raised in this book, which spans the fields of physics, biology, and cosmology. Each chapter examines a different subject, concluding with either an answer or, in the absence of sufficient data, a "best guess" conclusion. The author has made an effort to rule out every possibility before drawing a conclusion for each of the questions covered here, whether they relate to time travel, parallel universes, intergalactic travel, or the end of the world. Despite the fact that everyone will have their own opinions, one thing is certain: The universe's mysteries will captivate, inform, and stimulate you.