General information on cobalt:
http://www.chemistryexplained.com/elements/A-C/Cobalt.html
Cobalt - Element information, properties and uses | Periodic Table
Modern cobalt mining:
http://www.theguardian.com/global-development/2016/jan/19/children-as-young-as-seven-mining-cobalt-for-use-in-smartphones-says-amnesty
Dangers of arsenic trioxide:
http://www.atsdr.cdc.gov/MMG/MMG.asp?id=1200&tid=279
Cobalt Deficiency:
http://www.mineraldeficiency.net/cobalt-deficiency
Cobalt-60 dirty bomb:
Kean, Sam, (2010). Completing the Table... With a Bang (pp. 112-114). In The Disappearing Spoon: And Other True Tales of Madness, Love, and the History of the World from the Periodic Table of the Elements. New York: Little, Brown and Company.
Images:
https://en.wikipedia.org/wiki/File:Cobalt_Blue.JPG
https://commons.wikimedia.org/wiki/File:Cobalt-60.jpg
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