Which relative and successor of Trajan built a 2nd-century protective wall across northern Britain?

In Mexico, a C on a faucet stands for "caliente," which means what in English? A Portuguese "casa de fado" is a restaurant where diners are entertained by what? Which poet wrote, "A child said What is the grass? fetching it to me with full hands"? A church is called a cathedral when which official's chair, a "cathedra" in Latin, is there? What is the name for a dot marking a unit of value on dice or dominoes? In the New Testament, an angel tells which man in a dream, "Take the young child and his mother, and flee into Egypt"? In which 2004 film does a food critic name Adam Sandler's character the best chef in the country? Koko the gorilla learned to communicate using gestures from which language?