Apple prepares for new era after Tim Cook

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Apple is entering a major transition after CEO Tim Cook announced he's stepping down following 15 years at the helm of one of the world's most influential tech companies.

Cook will hand leadership to John Ternus, the company's head of hardware engineering.

It comes as Apple confronts big questions about its future.

William Brangham discussed more with Rolfe Winkler of The Wall Street Journal.

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