Nezaradené A history of global living conditions in 5 charts – Our World In Data 23. decembra 2016 miro https://ourworldindata.org/wp-content/uploads/2016/12/World-as-100-people-2-centuries-750×550.png https://ourworldindata.org/a-history-of-global-living-conditions-in-5-charts/ statistika,ludstvo,vyvoj,zdravie,edukacia
