Do you own any Mammy salt and pepper shakers? Do you know where they come from? Running now through April 9 at the Pick Museum of Anthropology at Northern Illinois University is an exhibit called Hateful Things. It’s a traveling exhibit by the Jim Crow Museum of Racist Memorabilia , which houses over 9,000 artifacts. Throughout American history, it was not uncommon to see African Americans depicted as sub-human: cookie jars, calendars, games, movies, product icons, and on. Not just sub-human,