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What Is a VPN, and Why You Need One

Have you ever connected to a public Wi-Fi network and wondered if someone, somewhere might be able to see your online activity? It's an entirely reasonable concern, considering the forces arrayed against your privacy. With a virtual private network (VPN), you can protect your information from prying eyes and regain a measure of privacy online.

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The robot smiled back

Columbia Engineering researchers use AI to teach robots to make appropriate reactive human facial expressions, an ability that could build trust between humans and their robotic co-workers and care-givers

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