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Siri's answer to the brain-teaser question "What's zero divided by zero" generates a response that people find both funny and unnerving. NPR hide caption

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NPR

Asked To Divide Zero By Zero, Siri Waxes Philosophical (And Personal)

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As the Apple Watch goes on sale Friday, it's unclear if the gadget and others like it can attain the utility and prominence smartphones have in the past eight years. Ryan Emberley/AP hide caption

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Ryan Emberley/AP

Will Apple's Newest Gadget Ignite A Smart Watch Movement?

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The San Francisco-based startup CellScope has built a tool to do ear exams at home, instead of going to the doctor. Cellscope hide caption

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Cellscope

Self-Tracking Gadgets That Play Doctor Abound At CES

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A customer sets up her new iPhone 6 at an Apple store in Beijing on Friday. A group says the Chinese government backed an attack against users of Apple's iCloud service, but the government denies the claim. Feng Li/Getty Images hide caption

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Feng Li/Getty Images

Cloud Data Security Concerns Raised After Reported Attack In China

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Apple CEO Tim Cook speaks in Cupertino, Calif., on Tuesday. The company unveiled a new mobile payment system called Apple Pay, which uses security built into the latest iPhones. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

The Samsung Galaxy Mega (from left), Samsung Galaxy S4 and Apple iPhone 5 are shown. Apple is expected to announce larger models of its smartphone on Tuesday. Richard Drew/AP hide caption

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Richard Drew/AP

Size Matters: Why Apple Is Expected To Unveil A Bigger iPhone

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One of the earliest iPhone prototypes. This system was pieced together to test early versions of the iPhone's software. Courtesy of Apple hide caption

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Courtesy of Apple

From The Birth Of The iPhone To An Era Of Lawsuits

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With the ability to control phone calls, texts, and audio, Apple's new CarPlay system will ensure drivers' "eyes and hands stay where they belong," the company says. CarPlay will be included in several car models this year. Apple hide caption

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Apple

Apple says it has sold 9 million iPhone 5s and 5c models since their launch on Friday. Here, staff members at an Apple retail store in Beijing cheer a customer after he bought a new iPhone. Andy Wong/AP hide caption

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Andy Wong/AP

The new iPhone 5s with fingerprint-unlocking technology is displayed during an Apple product announcement Sept. 10 in Cupertino, Calif. Justin Sullivan/Getty Images hide caption

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