Why do many people enjoy risky activities--skydiving, bullfighting, or fast driving--that cause fear in others? Every normal human being seems to need excitement at times, yet for years this need remained largely unstudied. Now a professor of psychology explains why we experience the need for excitement at various times and what happens when excitement-seeking goes wrong.

"Describes in countdown format 10 of the most dangerous stunts ever attempted"--Provided by publisher.

The world's leading scientific thinkers explore bold, remarkable, perilous ideas that could change our lives—for better . . . or for worse . . . From Copernicus to Darwin, to current-day thinkers, scientists have always promoted theories and unveiled discoveries that challenge everything society holds dear; ideas with both positive and dire consequences. Many thoughts that resonate today are dangerous not because they are assumed to be false, but because they might turn out to be true. What do the world's leading scientists and thinkers consider to be their most dangerous idea? Through the leading online forum Edge (www.edge.org), the call went out, and this compelling and easily digestible volume collects the answers. From using medication to permanently alter our personalities to contemplating a universe in which we are utterly alone, to the idea that the universe might be fundamentally inexplicable, What Is Your Dangerous Idea? takes an unflinching look at the daring, breathtaking, sometimes terrifying thoughts that could forever alter our world and the way we live in it. Contributors include Daniel C. Dennett • Jared Diamond • Brian Greene • Matt Ridley • Howard Gardner and Freeman Dyson, among others

"Describes 10 of the world's most dangerous machines in a countdown format"--Provided by publisher.

Extensive, advanced text of realistic tactical options for defeating violent offenders in life-threatening situations, including vehicle stops, domestic disturbances, armed robberies, building searches, barricaded subjects, and hostage officer crises. Addresses mental conditioning, tactical thinking and a host of special problems, whether you respond to dangerous calls alone, with a partner or as part of a tactical team. Used as a foundation for much training and for promotional exams.