[ExI] Pinker on the persistence of pessimism

[Dan]

http://www.cato.org/multimedia/cato-audio/steven-pinker-persistence-pessimism

Glad to see the list is back!

Regards,

Dan
 See my Kindle books at: 
http://www.amazon.com/Dan-Ust/e/B00J6HPX8M/
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