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Thoughts on Maslow’s Hierarchy
Lowell Heddings, better known online as the How-To Geek, spends all his free time bringing you fresh geekery on a daily basis. You can follow him on Google+ if you'd like.
Sapphires and rubies are both forms of Corrundum, a crystalline form of Aluminum Oxide. Only impurities in the crystal determine the different colors.
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