Having a caring, family-like connection with people not part of one’s family

When deciding on an apartment what should you do first?

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?

Name that largest artificial lake built in the 11th century