Conversation so far:
where was Human Torch born?
Growing up in Glenville, New York, a fictional Long Island suburban town.
Are there any other interesting aspects about this article?
Though a member of a world-famous team, Storm still lived primarily in Glenville and attended Glenville High School.
Here he thought he maintained a secret identity.
Did he have any siblings?
At 16, Storm joined his sister and her fiance, Reed Richards, in a space flight.
What happened after they went to space?
cosmic radiation transformed those three and spacecraft pilot Ben Grimm into superpowered beings who would become the celebrated superhero team the Fantastic Four.

Question: When did this occur?
Self-contained rewrite: When did becoming the fantastic four occur?