Bees gather which sweet flower secretion to make honey?

Which French scientist's 1860s method of gently heating wine to kill microbes now bears his name? What term describes beer served from a keg rather than a bottle? Which autumn celebration, now a giant beer festival, began in 1810 to mark the wedding of Bavaria's Crown Prince Ludwig? Bees are found on every continent except which one? Beethoven originally dedicated his "Eroica" Symphony to which leader? Beethoven was born in 1770 in which city, which later served as the capital of West Germany until 1990? Which opera, Beethoven's only one, was based on J.N. Bouilly's "Léonore" and premiered in 1805? What kind of religious work is Beethoven's "Missa Solemnis"?