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street." >> is anybody watching? does anybody care about this? >> the epic story of the globl financial crisis spreads. tonight frontline. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant, and peaceful world. and by reva and david logan, committed to investigative journalism as the guardian of the public interest. additional funding is provided by the park foundati...

street." >> is anybody watching? does anybody care about this? >> the epic story of the globl financial crisis spreads. tonight frontline. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant, and peaceful world. and by reva and david logan, committed to investigative journalism as the guardian of the public interest. additional funding is provided by the park foundati...

>> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant, and peaceful world. and by reva and david logan, committed to investigative journalism as the guardian of the public interest. additional funding is provided by the park foundation, dedicated to heightening public awareness of critil issues. and by tfrontline journalism fund, supporting investigative reporting and e...

>> is anybody watching? does anybody care about this? >> the epic story of the globl financial crisis spreads. tonight frontline. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant, and peaceful world. and by reva and david logan, committed to investigative journalism as the guardian of the public interest. additional funding is provided by the park foundation, dedic...

so i wasn't offended by that idea. it seemed like a pretty typical american goal, in fact. >> narrator: cathy o'neil, a mathematician, came to wall street in 2007 after beginning her career in academia. >> i went to u.c. berkeley as an undergrad. i went to harvard for grad school. and then i was a postdoc for five years at mit. and i applied to work at a hedge fund, d.e. shaw, and i got the job. and i thought, "this was great." i was a quant. a quant uses statistical methods to try to predict patterns in the market. >>arrator: h worwas used to predict when big pension funds would buy...