http://www.ted.com/talks/steve_keil_a_manifesto_for_play_for_bulgaria_and_beyond.html
Isabel Behncke: "Evolution's Gift of Play, from Bonobo Apes to Humans"
http://www.ted.com/talks/isabel_behncke_evolution_s_gift_of_play_from_bonobo_apes_to_humans.html
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