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 and Lois Lane saves her. From then on, Clark was established as a shy man attracted to Lois, while she was interested in his heroic alter ego, Superman. This remained the status quo in the comics for decades, though Lois did warm up to Clark for the most part; yet their relationship couldn't really advance with Lois left out of Clark's secret and the Clark Kent persona is a disguise. As early as the 1940s, Lois began to suspect that Clark Kent was Superman, the first such story appears in "Superman" #17 (July–August 1942) in a story titled "Man or Superman" by Jerry