Conversation so far:
Who did Gary Cooper become friends with?
Gary Cooper became friends with Ernest Hemingway.
How did Gary Cooper become friends with Ernest Hemingway?
Gary Cooper and Ernest Hemingway shared a passion for the outdoors and often went hunting together.
Where did Gary Cooper and Ernest Hemingway meet?
Gary Cooper and Ernest Hemingway met in Sun Valley, Idaho in 1940.

Question: What were some of Cooper's interests?
Self-contained rewrite: What were some of Gary Cooper's interests?