Kindness is a behavior marked by ethical characteristics, a pleasant disposition, and concern and consideration for others. It is considered a virtue, and is recognized as a value in many cultures and religions (see ethics in religion). Kindness is a behavior marked by ethical characteristics, a pleasant disposition, and concern and consideration for others. It is considered a virtue, and is recognized as a value in many cultures and religions (see ethics in religion). In Book II of 'Rhetoric', Aristotle defines kindness as 'helpfulness towards someone in need, not in return for anything, nor for the advantage of the helper himself, but for that of the person helped'. Nietzsche considered kindness and love to be the 'most curative herbs and agents in human intercourse'. Kindness is considered to be one of the Knightly Virtues. In Meher Baba's teachings, God is synonymous with kindness: 'God is so kind that it is impossible to imagine His unbounded kindness!' In human mating choice, studies suggest that both men and women value kindness and intelligence in their prospective mates, along with physical appearance, attractiveness, social status, and age. A 'nice guy' is an informal and usually stereotypical term for an (often young) adult male who portrays himself as gentle, compassionate, sensitive, and/or vulnerable. The term is used both positively and negatively. When used positively, and particularly when used as a preference or description by someone else, it is intended to imply a male who puts the needs of others before his own, avoids confrontations, does favors, gives emotional support, tries to stay out of trouble, and generally acts nicely towards others. In the context of a relationship, it may also refer to traits of honesty, loyalty, romanticism, courtesy and respect. When used negatively, a nice guy implies a male who is unassertive, does not express his true feelings and, in the context of dating (in which the term is often used), uses acts of ostensible friendship with the unstated aim of progressing to a romantic or sexual relationship. Based on experiments at Yale University using games with babies, some studies concluded that kindness is inherent to human beings. There are similar studies about the root of empathy in infancy - motor mirroring developing in the early months of life, to lead (optimally) to the easy concern shown by children for their peers in distress. Barbara Taylor and Adam Phillips have stressed the element of necessary realism in adult kindness, as well as the way “real kindness changes people in the doing of it, often in unpredictable ways”. Based on the novel of the same name written in 1999 by author Catherine Ryan Hyde, the motion picture Pay it Forward, which starred Kevin Spacey, Helen Hunt, Haley Joel Osment and Jon Bon Jovi, illustrates the power one person can have to make an impact on a chain reaction of kind deeds. The philosophy of Pay It Forward is that through acts of kindness among strangers, we all foster a more caring society. In the book and film, Reuben St. Clair, a social studies teacher in Atascadero, California, challenges his students to 'change the world'. One of his students, Trevor, takes the challenge to heart. He starts by showing kindness to a stranger which ripples further than he could have ever imagined. In October 2011, Life Vest Inside posted a video called 'Kindness Boomerang'.It shows how one act of kindness passes seamlessly from one person to the next and boomerangs back to the person who set it into motion. Orly Wahba, Life Vest Inside Founder and Director of Kindness Boomerang explains that each scene was based on real life experiences she personally went through; moments of kindness that left a lasting impression on her life. Within several months after its release, Kindness Boomerang went viral; reaching over 20 million people globally and eventually landing Wahba spot on the TED2013 stage to speak about the power of kindness.