As the company preps for a changing of the guard at the top, it's important that Apple stay hungry, stay foolish.

As the company preps for a changing of the guard at the top, it's important that Apple stay hungry, stay foolish.

John Ternus takes over as Apple's chief executive on Tuesday, inheriting a company that towers over the smartphone market but trails its rivals in artificial intelligence.

Cook will move into the role of executive chairman, while Ternus will join Apple’s board the same day. Cook has played a central role in expanding the company’s business and…