Before heroes took the skies or came from mythical lands, the Marvel Cinematic Universe was a world of spies where heroism took place in the shadows. From Ant-Man to Peggy Carter, espionage made a world of difference in keeping Earth safe. Because of its long history, organizations like S.H.I.E.L.D. became exceptionally skilled at hiding in plain sight, sneaking up on even the most savvy characters. A great example of this was Tony Stark, who met Natasha Romanoff after she had already infiltrated Stark Industries.
Source：https://www.cbr.com/tony-stark-greatest-weakness-plain-sight/
