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Opinion: A Siri Speaker can learn a lot from Amazon's Echo, but its success really depends on improvements to Siri - 9to5Mac
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How Siri, Alexa, Google Now and others can be hijacked without your knowing it - The Washington Post
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Inaudible ultrasound commands can be used to secretly control Siri, Alexa, and Google Now - The Verge
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Have you ever wondered how Amazon Echo, Siri or Google Home work? | by Paola German | Coinmonks | Medium
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