Superman (1939). Certain materials such as lead can block his X-ray vision. Superman can project beams of heat from his eyes which are hot enough to melt steel. He first used this power in "Superman" #59 (1949) by applying his X-ray vision at its highest intensity. In later stories, this ability is simply called "heat vision". Superman can hear sounds that are too faint for a human to hear, and at frequencies outside the human hearing range. This ability is introduced in "Action Comics" #11 (1939). "Action Comics" #1 (1938) explained that Superman's strength was common to all Kryptonians because they
Superman first toy was a wooden doll in 1939 made by the Ideal Novelty and Toy Company. "Superman" #5 (May 1940) carried an advertisement for a "Krypto-Raygun", which was a gun-shaped device that could project images on a wall. The majority of Superman merchandise is targeted at children, but since the 1970s, adults have been increasingly targeted because the comic book readership has gotten older. During World War 2, Superman was used to support the war effort. "Action Comics" and "Superman" carried messages urging readers to buy war bonds and participate in scrap drives. Superman has also featured as an inspiration