Who was the first African American U.S. Senator?

Hiram Revels

What prophet shaved his head and beard as an object lesson of God's judgment? Which ghost haunts the girls’ bathroom at Hogwarts? What type of grain was plentiful at the first Thanksgiving but rarely used today in Thanksgiving meals? In Iceland, which creatures visit children in the 13 days leading to Christmas, leaving gifts or potatoes in their shoes? Which country features 'Las Posadas' celebrations during the Christmas season?