The Yale School of Art exhibition “Side Show” is devoted to the “believe it or not” world of the American sideshow, in which display of the abnormal and bizarre was the focus of the event. On view through Mar. 20 at the 32 Edgewood Avenue Gallery, the exhibition is free and open to the public Tuesdays–Sundays from noon to 6 p.m. “Side Show” presents more than 50 works by 29 artists — including Diane Arbus, Otto Dix, John Waters, and Riva Lehrer — ranging from the mid-18th century to the present. The show includes original sideshow banners, props, promotional cards, photographs, historical ephemera, and works of art inspired by circus and carnival culture. A complementary exhibition, “Teratology: The Science and History of Human Monstrosity,” opens at Yale’s Cushing Medical Library on Jan. 22. Located at 333 Cedar St., the library’s installation is on view through May 15 and includes books, prints, and broadsides. Both exhibitions are free and open to the public.