Is time travel possible? What happens when we die? Do UFOs exist? This book poses 18 significant questions about life and attempts to provide reasonable, empirical answers. Assessing the available evidence instead of relying on supernatural approaches, this popular science book reaches possible conclusions while providing explanations to scientific principles through everyday situations. Covering a variety of topics--from the power of prayer to extraterrestrials--this reference will appeal to those with a scientific background as well as general audiences seeking a greater understanding of the universe.