Highlight: In 1913, British metallurgist Harry Brearley developed an alloy that came to be known as “stainless steel." (Although Brearley is often credited as the “inventor" of stainless steel, he was hardly alone in working to create steel that resisted corrosion.)In 1521, Spanish conqueror Hernando Cortez captured Tenochtitlan, present-day Mexico City, from the Aztecs.