YouTube's history and search history are separate tabs that users may want to use to clear their past usage, as seen in this screen grab. NPR hide caption

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What would the world look like seen through Google's eyes? AFP/AFP/Getty Images hide caption

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Chris Urmson (right) and Anthony Levandowski, one of the leaders of Google's self-driving car project, get into the driverless car. Steve Henn/NPR hide caption

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A screengrab shows Google's new search feature, in which results from a user's Google+ community are promoted at the top of the page. NPR hide caption

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A screengrab shows the Google Wallet app being used to pay for items at a CVS store.

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For his upcoming biography of Apple co-founder Steve Jobs, Walter Isaacson conducted more than 40 interviews with the enigmatic tech leader.

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Republican presidential candidate former Massachusetts Gov. Mitt Romney, right, makes a point as Texas Gov. Rick Perry listens, during a debate in Orlando, Fla. Phelan M. Ebenhack/AP hide caption

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