It wasn't immediately obvious to Walter Semkiw that he was the reincarnation of John Adams. Semkiw is a doctor. In 1984, a psychic told the then [skeptical] medical resident and psychiatrist-in-training that he is the reincarnation of a major figure of the Revolution, possibly Adams. But one day in 1995, when Semkiw was the medical director for Unocal 76, the oil company, he heard a voice in his head intoning, Study the life of Adams!" Now he found details much more telling than those silly coincidences he had learned a dozen years earlier. It was all so persuasive, thought Semkiw ... that as a man of science and reason whose work requires him to critically evaluate empirical evidence, he had to accept that he was Adams reincarnated. If you have never had a paranormal experience ... you are in a lonely minority. According to periodic surveys by Gallup and other pollsters, fully 90 percent of Americans say they have experienced such things or believe they exist. Raised as a Roman Catholic, Semkiw is driven by a what-if optimism. If only people could accept reincarnation, he believes, Iraq's Sunnis and Shiites might stop fighting (since they might be killing someone who was once one of them). He is dismissive of the idea that reincarnation has not been empirically proved. That was the status of everything science has since proved, be it the ability of atoms to vibrate in synchrony (the basis of the laser) or of mold to cure once-lethal infections (penicillin). Dedicated to the empirical method, Semkiw believes the world is on the brink of "a science of spirituality."