There is no place on the Earth, the planet we live on, where the natural background radiation level is zero. Since the birth and even in our fetal stage, we have been exposed to different sources of natural radiation. Life, in fact, evolved in a radiation environment that was much more harsh than today. Earth serves as a source of terrestrial radiation. Uranium, thorium, and radium are among th...

The article highlights the results of a theoretical study concept heutagogy, its foundations and principles. Heutagogy is based on humanistic theory approaches to learning, applying holistic approach development adult learners' abilities. It presents new an innovative model learning that meets current requirements time, complex dynamic changes define our lives are reflected in need for continuo...

background: parenting style in communication with teenagers is a complex and double way process that affects progress and success of all generations both at present time and future. due to the importance of having accurate knowledge about mothers' parenting style and its underlying factors, it has been assessed in this study. methods: this study was a descriptive cross-sectional study on 737 fe...