Dennis McKenna on the Co-Evolution of Plants and Humans Derrick Broze April 13, 2015 5140 Text to Audio Player 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
