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.
Human nature is the common qualities of all human beings. People behave according to certain principles of human nature. Human needs are an important part of human nature. Values, beliefs, and customs differ from country to country and even within group to group, but in general, all people have a few basic needs.