A view of facilities at the Manus Island Regional Processing Facility in Papua New Guinea in 2012. For years, the facility has been used to indefinitely detain asylum-seekers; Australia and Papua New Guinea have now agreed to close it. Australian Department of Immigration and Citizenship via Getty Images hide caption

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Diamond argues that there are things we can learn from small-scale societies like those found in Papua New Guinea. Torsten Blackwood/AFP/Getty Images hide caption

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Chances are they already speak more languages than you: children from Papua New Guinea's Andai tribe of hunter-gatherers wait for their parents to vote in the village of Kaiam. Over 800 languages are spoken in PNG, a country of about six million people. Torsten Blackwood/AFP/Getty Images hide caption

toggle caption Torsten Blackwood/AFP/Getty Images