[Vikingv]

How the world has changed will depend on the nature of the superhuman abilities. A world where most superhumans get only one trait (fire power powers, for example) will be different from a world where the abilities are random.

After 70 years, paranoia will likely be ramped down but there might still be a great deal of envy from the normals.

Also of note, if the potential for genetic change were higher in the few days right after the insecticide was sprayed, that could result in certain classes of people (farmers, for example) having a higher representation in the superhuman community
.