Superman Supacomic #178

In "Clark Kent's College Days," a young Clark Kent reflects on his time at college, recalling a tense encounter with Professor Maxwell, a scientist determined to prove whether Clark Kent was secretly Superboy. The professor subjects Clark to a polygraph test, asking if he is Superboy—Clark’s calm, honest "No" marks a turning point in his identity, as he begins to see himself not as a teenage hero, but as the full-fledged Superman he’s becoming.