AdvertisementWhy Cleaned Wastewater Stays Dirty In Our Minds06:19Download AudioResumeAugust 16, 2011Alix SpiegelfacebookEmailA boom sweeps around a tank at a sewage treatment plant in Coos Bay, Ore. Even though sewage water can be treated and cleaned, psychologists say getting the "cognitive sewage" out of the water is much more difficult. (AP)
