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Video: Ever wonder how lithium is mined for batteries?
Damage done by Agent Orange in Vietnam was caused by 2,3,7,8-tetrachlorodibenzo-para-dioxin. Google search 'agent orange impurity' gives more than enough. For example...
New competition for Elons Mars colony: Asgardia - The Space Nation
Both share this problem: http://phys.org/news/2016-10-mars-bound-astronauts-chronic-dementia-galactic.html
Although Earths magnetic field protects Asgardia from most of radiation. Another study about radiation in space Apollo...