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I have added an original research tag to the large section added to this article (Control of gases in spacecraft, and SMACs (Spacecraft Maximum Allowable Concentrations)), that says it is from "Spaceflight - Letters and emails (September 2006, p 353)", because this is not cited as a book, there is no evidence via a Google search that this is a book, no ISBN given, etc. Therefore, the source is not verifiable; emails and letters are not reliable sources unless published in a book, and the sections needs to be backed up by a reliable, third-party source. If a source can not be found to verify the information, it will likely be removed. Verifiability is one of the three main policies on Wikipedia, and reliable sources for articles such like this need to be properly cited. If anyone can provide information about if this source is a book, provide the ISBN, etc., I'd really appreciate it! Ariel ♥ Gold 01:10, 22 October 2007 (UTC) reply

Yet nothing in this article mentions how astronauts "shower" (keep clean) or eliminate body wastes. In fact, most of this article seems more to do with risks to astronaut's health while on orbit. - Ageekgal ( talk) 18:36, 1 September 2009 (UTC) reply

See Wikipedia talk:WikiProject Spaceflight#Serious problem with our articles on the effects of spaceflight on human physiology - Anxietycello ( talk) 20:12, 22 April 2012 (UTC) reply

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