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Many minor projects , such as single-family homes , remodeling , and accessory structures are exempt from the CEQA requirements ( for a complete list see the California Environmental Quality Act Guidelines ) . Mayo Clinic ’ s Division of Radiation Oncology has exceptional patient care facilities with advanced therapy equipment , which includes linear accelerators with dual asymmetric jaws , multi-leaf collimators , electronic portal imaging and IMPAC treatment verification software . We will begin with the clash between the cultures of European conquerors and native peoples in the Americas and consider how some advanced native civilizations , such as the Aztecs , collapsed so rapidly . Except for a few specialized cases , such as the tetraodontoxin from puffer fish , and some food-borne allergens , there do not appear to be many general public health problems associated with these naturally occurring compounds .