I was in Columbia in 1938 and Schwinger was in trouble; he couldn't get his Ph.D. because he didn't go to lectures of the mathematicians and he didn't have enough credits.
Ako ay sa Columbia sa 1938 at Schwinger ay sa problema; siya ay hindi makuha ang kanyang Ph.D. dahil siya ay hindi pumunta sa lektura ng mga mathematicians at siya ay walang sapat na credits.