This contract may include the provision that the debtor may repay the debt in kind, lending the same amount to a similarly disadvantaged party once they have the means, and under the same conditions."[1] American author and former war correspondent Richard Harding Davis, had already published a popular short story in The Metropolitan Magazine (dated March, 1914) entitled "The Boy Scout," that also dealt directly with the same concept.Woody Hayes (1913–1987), winner of five national titles as football coach at Ohio State University, misquoted Emerson as having said "You can pay back only seldom.He is hungry and a stranger gives him enough to pay for lunch: The banker reached into the folds of his gown, pulled out a single credit note."[2]The mathematician Paul Erdős heard about a promising math student unable to enroll in Harvard University for financial reasons.Afterwards, they meet in their secret identities, with Peter Parker warning Bruce Banner to leave town because of the Hulk's seeming attack on police.[11] There has, however, been some controversy around them, as Baristas who experience them complain about mixed up orders [12] while other customers have found themselves stuck with significantly larger payments than the cost of their food and potential confrontations as a result.[14] In 1999, Catherine Ryan Hyde's novel Pay It Forward was published and then adapted in 2000 into a film of the same name, distributed by Warner Bros. and starring Kevin Spacey, Helen Hunt and Haley Joel Osment.In this way, the practice of helping one another can spread geometrically through society, at a ratio of three to one, creating a social movement with an impact of making the world a better place.The Pay it Forward Foundation was founded in the United States helping start a ripple effect of kindness acts around the world.On April 5, 2012, WBRZ-TV, the American Broadcasting Company affiliate for the city of Baton Rouge, Louisiana, did a story on The Newton Project,[18] a 501(c)(3) outreach organization created to demonstrate that regardless of how big the problems of the world may seem, each person can make a difference simply by taking the time to show love, appreciation and kindness to the people around them.It is based on the classic pay-it-forward concept, but demonstrates the impact of each act on the world by tracking each wristband with a unique ID number and quantifying the lives each has touched.The Newton Project's attempt to quantify the benefits of a Pay It Forward type system can be viewed by the general public at their website.Evolutionary biologists and psychologists argue that being helped or harmed leads to an emotional reaction such as gratitude or anger, which in turn trigger the respective behavior.