Conversation so far:
When did Abner Doubleday have a relationship with baseball?
Abner Doubleday is more widely known as the supposed inventor of the game of baseball, in Elihu Phinney's cow pasture in Cooperstown, New York, in 1839.

Question: How did he invent baseball?
Self-contained rewrite: How did Abner Doubleday invent baseball?