Butyl rubber and EPDM (ethylene propylene diene monomer - a synthetic rubber) are the two best flexible liners for water garden construction. Each of these materials is UV stable and should last 20 years or more. EPDM and butyl rubber are generally available in 45 mil and 60- or 30-mil thicknesses, respectively.
human behavior. The capacity of mental, physical, emotional, and social activities experienced during the five stages of a human being's life-prenatal, infancy, childhood, adolescence, and adulthood.
Top definition. Human nature. An excuse for people to be dicks to each other. An invalid argument usually used against Anarchy and Communism. The impulse to survive. If the best way to survive in a given society is to compete and gather more wealth than the next guy, humans in that society will strive to compete. Likewise, if survival requires cooperation, then the human will strive for cooperation. Ner ner ner, human nature.