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.

Question: What else did he find?
Self-contained rewrite: What else did James Cook do in Newfoundland besides being involved with the Admirality and Royal Society?