Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Waldo Vieira (born 12 April 1932) is a Brazilian dentist and physician who first proposed the theories of projectiology and conscientiology, two closely-related proposed sciences which posit that human consciousness is a non-physical phenomenon. That is, Vieira argues that consciousness has an existence independent from the body, basing his claims on various accounts of out-of-body experiences. He has written over twenty books on the subject, and claims to have had out-of-body experiences on numerous occasions.