Sam Altman mentioned Guns, Sails, and Empires by Caro M. Cipolla 1 times

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Guns, Sails, and Empires: Technological Innovation and the Early Phases of European Expansion, 1400- 1700 by Caro M. Cipolla
  1. it was excellent!

    — Sam Altman

    2015-02-18 on twitter.com