How to make a superhero<br>Think about accidental or " nuclear " superpowers. Some characters have " nuclear " powers, which means that they've come in contact with some kind of substance that has given them super-human powers. This was especially popular during the 1940s in the " golden age " of comics when nuclear technology was on the rise.
In the the post-depression era, it was common for superheros to get their powers from nuclear substances. 
The 1940's would be considered the post-depression era; the context states that in the 40's, many superheros were given their powers from nuclear substances. 