Many people have experienced unusual or intriguing phenomena, such as dreams that later seem to correspond with unforeseeable events, thinking of a long-lost friend just before he or she unexpectedly calls, or the ability to ""feel"" the presence of deceased loved ones. What many do not realize is that these types of experiences have been researched for more than a century by eminent scientists, including Nobel laureates. Most of these researchers have concluded that some of these phenomena do occur, although we are far from explaining them to everyone's satisfaction. This book is the first in more than 40 years to provide a comprehensive scientific overview of research in the field of parapsychology, explaining what we know and don't know about so-called psi phenomena, such as ""telepathy,"" ""precognition"" or ""psychokinesis."" Contributors evaluate the evidence for these phenomena, accounting for factors such as selective memory, wish fulfillment and incorrect methods or analyses, in some cases offering psychological, physical and biological theories.