Conversation so far:
What was Isaac Asimov's first job
Isaac Asimov spent three years during World War II working as a civilian chemist at the Philadelphia Navy Yard's Naval Air Experimental Station.
What was Isaac Asimov age of starting school?
Isaac Asimov attended New York City public schools from age 5.
What school didIsaac Asimov attend?
Boys High School in Brooklyn
What age did Isaac Asimov graduate high school
Graduating at 15
What college did Isaac Asimov attend?
Isaac Asimov attended the City College of New York for several days before accepting a scholarship at Seth Low Junior College.
What Seth Low Junior College apart of?
a branch of Columbia University
Where is Columbia University located?
Downtown Brooklyn
what degree did Isaac Asimov go for?
Originally a zoology major, Asimov switched to chemistry.

Question: Why did he change
Self-contained rewrite: Why did Isaac Asimov change majors?