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 character and cast the more mild-mannered Clark Kent that is traditionally associated with the character. Clark is a reporter at the Metropolis newspaper the "Daily Planet", which allows him to keep track of events in which he might be able to help. Fellow reporter Lois Lane is often the object of Clark's affection. Lois's affection for Superman and rejection of Clark is a recurring theme in Superman comics and media adaptations. In the Modern Age comics Superman considers himself Clark Kent first and Superman second. Before the Crisis on Infinite Earths (i.e., DC comics published up to the early 1980s), the attitude was