What is the relationship between power and authority?

Why was charliemagne hesitant about being crounded holy roman emperor?

Who was put in the concentration camps? and why

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?