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Links :

Gems :
http://www.swalagemtraders.com

Gemstone travel blog :
http://www.fieldgemology.org/http://www.fieldgemology.org/

Rubies and sapphires :
http://www.ruby-sapphire.com/ruby-sapphire-collectors-guide/index-ruby-sapphire-collectors-guide.php

Cancer :
http://www.jamesgraham.bz/cancerselectioni.html
http://www.nejm.org/doi/full/10.1056/NEJM199907013410120

Deep carbon science :
http://deepcarbon.net/

Language museum, Paris :
http://www.mundolingua.org/