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Carl Calleman is a scientist with a Ph.D. in physical biology from the university of Stockholm. A former senior researcher of environmental health at the University of Washington in Seattle and expert on chemical carcinogens for the world Health Organization, he is the author of 7 books on Maya, including The Nine waves of Creation and his latest, The Quantum Science of Psychedelics in which, among other things, he explains why altered states of consciousness exist and how they work.
In order to understand the effect of psychedelics, Dr. Calleman went through a number of plant medicine ceremonies that changed his life.
www.calleman.com
www.calleman.com/books/

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