If you've ever farted in the shower, you know that they smell REALLY bad in there, but why is that?

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Sources:

http://health.howstuffworks.com/mental-health/human-nature/perception/smell1.htm
https://www.ncbi.nlm.nih.gov/pubmed/17901967
http://www.telegraph.co.uk/news/science/science-news/10574977/Why-does-cold-air-smell-differently-from-hot-air.html
http://www.abc.net.au/news/health/2016-07-20/fart-quiz-how-much-do-you-know-about-flatulence/7644818