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Sources:
http://gawker.com/5985723/can-you-eat-your-own-poop
http://www.who.int/water_sanitation_health/resources/vector302to323.pdf
https://home.howstuffworks.com/toilet.htm
http://www.bbc.com/news/business-41188465
http://www.worldwidewords.org/qa/qa-cra1.htm
http://nymag.com/strategist/article/best-poop-spray-drops-toilet-freshener.html
https://fabulousfarmgirl.com/diy/poo-poo-spray/
https://www.poopourri.com/pages/how-it-works
https://lifehacker.com/banish-brutal-bathroom-smells-with-your-own-homemade-p-1745308178
https://science.howstuffworks.com/innovation/everyday-innovations/porta-potties2.htm
https://www.polyportables.com/portable-toilet-chemicals/
http://www.safetfresh.com/resources/deodorizer-usage-tips.php
http://www.essentialchemicalindustry.org/materials-and-applications/surfactants.html
https://science.howstuffworks.com/transport/flight/modern/question314.htm
https://gizmodo.com/5953877/what-happens-when-you-flush-a-toilet-on-an-airplane
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4692156/
http://www.cbc.ca/news/health/hazards-of-public-toilet-use-debunked-1.3172754
https://www.womenshealthmag.com/health/a19985012/public-bathroom-facts/
https://www3.epa.gov/npdes/pubs/bastre.pdf
http://www.nyc.gov/html/dep/html/wastewater/index.shtml
http://www.nyc.gov/html/dep/html/wastewater/wwsystem-process.shtml
http://ssu.ac.ir/cms/fileadmin/user_upload/Daneshkadaha/dbehdasht/markaz_tahghighat_olom_va_fanavarihaye_zist_mohiti/e_book/Wastewater_Bacteria.pdf
https://www.newscientist.com/article/mg23130840-100-bacteria-made-to-turn-sewage-into-clean-water-and-electricity/
http://illumin.usc.edu/134/microbial-fuel-cells-generating-power-from-waste/
https://theanalystfinancial.com/127859/microbial-fuel-cell-market-competitive-intelligence-and-tracking-report-2017-2025/
http://www.un.org/waterforlifedecade/sanitation.shtml
Additional Sources:
http://www.travelandleisure.com/airlines-airports/what-happens-when-airplane-toilet-flushes
https://sciencing.com/calculate-force-falling-object-6454559.html
Image Sources:
http://www.thinkstockphotos.com/image/stock-photo-white-toilet-bowl-in-a-bathroom/453099407/popup?sq=toilet/f=CPIHVX/s=DynamicRank
https://www.istockphoto.com/vector/cleaning-clogging-in-the-pipe-gm962187978-262778418
https://en.wikipedia.org/wiki/File:Cummings_S-bend.jpg
https://commons.wikimedia.org/wiki/File:Thomas_Crapper.jpg
https://www.istockphoto.com/vector/contamination-in-the-water-pipe-gm904094406-249337641
https://commons.wikimedia.org/wiki/File:Four_types_of_pedestal_WC.svg
https://www.istockphoto.com/photo/studio-shot-of-white-spray-plastic-bottle-isolated-on-white-background-gm497470523-41809896
https://www.istockphoto.com/photo/toilet-seat-gm925861132-254064774
https://commons.wikimedia.org/wiki/File:Clostridium_difficile_01.jpg
https://commons.wikimedia.org/wiki/File:Norwalk.jpg
https://www.istockphoto.com/photo/toilet-entrance-gm697587660-129208407
https://www.istockphoto.com/photo/toilet-on-board-gm160612631-22957260
https://commons.wikimedia.org/wiki/File:Vickers_Wellington_-_Royal_Air_Force_Bomber_Command,_1939-1941._CH478.jpg
https://www.istockphoto.com/photo/microscopic-blue-bacteria-background-gm628978952-111796005
https://www.istockphoto.com/photo/sourdough-bread-gm943159894-257724497