Final answer:
When Franklin was 21 yrs old, he helped to establish the American Philosophical Society, a society of intellectuals who met together for inquiry and conversation.
Step-by-step explanation:
When Franklin was 21 yrs old, he helped to establish the American Philosophical Society, a society of intellectuals who met together on a regular basis for "inquiry, experiment, instruction, and conversation." Franklin's role in establishing this society highlights his commitment to intellectual pursuits and the spirit of inquiry during the Enlightenment era.