Eventually, "this muscle suit came up, with nanofibres that would ... caught the attention of the real-life nanotech community. How disappointed do you think the nano-nerds were when they realised ...

Following is a transcript of the video. Narrator: If you look at Iron Man's first suit, the Mark 1, and compare it to the hero's nanotech suit from "Avengers: Endgame," a lot has changed.