American comic book Kane and Bill Finger created Batman, who debuted in "Detective Comics" #27 (1939). The period from the late 1930s through roughly the end of the 1940s is referred to by comic book experts as the Golden Age of comic books. It featured extremely large print-runs, with "Action Comics" and "Captain Marvel" selling over half a million copies a month each; comics provided very popular cheap entertainment during World War II especially among soldiers, but with erratic quality in stories, art, and printing. In the early 1940s over 90 percent of girls and boys from seven to seventeen read comic books.
Bob Kane the script of that, so he really was co-creator, and Bob and I did the visuals, so Bob was also." According to comics historian Les Daniels, "nearly everyone seems to agree that Two-Face was Kane's brainchild exclusively". Catwoman, originally introduced by Kane with no costume as "the Cat", was partially inspired by his cousin, Ruth Steel. Kane, a frequent movie goer, mentioned that Jean Harlow was a model for the design and added that "I always felt that women were feline". Kane created the Scarecrow and drew his first appearance, which was scripted by Finger. Kane also created the original