Dennis McKenna on the Co-Evolution of Plants and Humans Derrick Broze April 13, 2015 3924 Derrick Broze interviews American ethnopharmacologist, research pharmacognosist, lecturer and author Dennis J. McKenna, PH.D at the Free Your Mind Conference 2015 in Philadelphia. Find more videos like this at: www.theconsciousresistance.com Leave a ReplyYour email address will not be published.CommentName* Email* Website Solve Math Problem: 7 × one = Δ
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