Conversation so far:
When did William Thomson, 1st Baron Kelvin attend CAmbridge?
in 1841, installed him, with extensive letters of introduction and ample accommodation, at Peterhouse, Cambridge.
What did he study there?
The study of mathematics, physics, and in particular, of electricity, had captivated his imagination.
Did he belong to any clubs?
While at Cambridge, Thomson was active in sports, athletics and sculling, winning the Colquhoun Sculls in 1843.
Did he have any other interests?
He was elected a fellow of St.
Peter's (as Peterhouse was often called at the time) in June 1845.
What did he do as a fellow?
On gaining the fellowship, he spent some time in the laboratory of the celebrated Henri Victor Regnault, at Paris.
What did he do after his fellowship?
At twenty-two he found himself wearing the gown of a learned professor in one of the oldest Universities in the country.
How long did he teach?
CANNOTANSWER.

Question: What subject did he teach?
Self-contained rewrite: What subject did William Thomson teach?