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The Animal in You is a 1995 non-fiction book by Roy Feinson, which posits a biological basis as to why people tend to exhibit personality traits similar to animal species. The book hypothesizes that through the process of convergent evolution, people adopt a niche set of behaviors enabling them to cope with their particular social milieu in the same way as individual animal species adapt to their environments. The book has been translated into ten different languages, including Mandarin, Japanese, Czech, Hebrew and French, and has been featured on CNN, The Dr. Phil Show and CBS The Talk

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The Authoritarian Personality is a 1950 sociology book by Theodor W. Adorno, Else Frenkel-Brunswik, Daniel Levinson, and Nevitt Sanford, researchers working at the University of California, Berkeley, during and shortly after World War II.

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Motivation and Personality is a book on psychology by Abraham Maslow, first published in 1954. Maslow's work deals with the subject of the nature of human fulfillment and the significance of personal relationships, implementing a conceptualization of self-actualization. Underachievers have a need for social love and affection, but a self-actualized person has these "lower" needs gratified and is able to pursue his or her own path towards self-actualization.

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Please Understand Me: Character and Temperament Types is a psychology book written by David Keirsey and Marilyn Bates which focuses on the classification and categorization of personality types. The book contains a self-assessed personality questionnaire, known as the Keirsey Temperament Sorter, which links human behavioral patterns to four temperament types and sixteen character types. Once the reader's personality type has been ascertained, there are detailed profiles which describe the characteristics of that type.

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Psychological Types is a book by Carl Jung that was originally published in German by Rascher Verlag in 1921, and translated into English in 1923, becoming volume 6 of The Collected Works of C. G. Jung.

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The Quantum Thief is the debut science fiction novel by Finnish writer Hannu Rajaniemi and the first novel in a trilogy featuring the character of Jean le Flambeur; the sequels are The Fractal Prince (2012) and The Causal Angel (2014). The novel was published in Britain by Gollancz in 2010, and by Tor in 2011 in the US. It is a heist story, set in a futuristic Solar System, that features a protagonist modeled on Arsène Lupin, the gentleman thief of Maurice Leblanc.

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Quiet Power: The Secret Strengths of Introverts is a 2016 non-fiction book written by Susan Cain with Gregory Mone and Erica Moroz, and illustrated by Grant Snider.

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Quiet: The Power of Introverts in a World That Can't Stop Talking is a 2012 non-fiction book written by Susan Cain. Cain argues that modern Western culture misunderstands and undervalues the traits and capabilities of introverted people, leading to "a colossal waste of talent, energy, and happiness".

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Snapping: America's Epidemic of Sudden Personality Change is a 1978 book which describes the authors' theory of religious conversion. They propose that "snapping" is a mental process through which a person is recruited by a cult or new religious movement, or leaves the group through deprogramming or exit counseling. Political ideological conversions are also included, with Patty Hearst given as an example.