Conversation so far:
What did James Cook do in Newfoundland?
His five seasons in Newfoundland produced the first large-scale and accurate maps of the island's coasts and were the first scientific.
Who sent him to Newfoundland?
1760s, aboard HMS Grenville.
Did he find anything interesting there?
the Admiralty and Royal Society at a crucial moment both in his career and in the direction of British overseas discovery.
What else did he find?
attention of the Admiralty and Royal Society at a crucial moment both in his career and in the direction of British overseas discovery.
Cook's map would.
Do we still use his maps?
discovery.
Cook's map would be used into the 20th century--copies of it being referenced by those sailing Newfoundland's waters for 200 years.

Question: Did he learn any other interesting things?
Self-contained rewrite: Did James Cook learn any interesting things besides mapping Newfoundland?