https://www.hachettebookgroup.com/titles/peter-gray/free-to-learn/9780465084999/
Feb 10, 2015 - Hachette Book Group is a leading book publisher based in New York and a division of Hachette Livre, the third-largest publisher in the world.
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https://libcom.org/comment/556948
Excellent article by Dr Peter Gray, explaining how hunter-gatherer societies lack a conception of "work" as they make no distinction between work and play....
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https://www.gray-blog.com/blog/adfectus
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https://petergraycartoonsandcomics.blogspot.com/2008/
http://petergraycartoonsandcomics.blogspot.com/ https://www.facebook.com/groups/1432139416803249/
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